<?php

namespace GetId3\Module\AudioVideo;

use GetId3\Handler\BaseHandler;
use GetId3\Lib\Helper;
use GetId3\GetId3Core;
use GetId3\Module;

/////////////////////////////////////////////////////////////////
/// GetId3() by James Heinrich <info@getid3.org>               //
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
/////////////////////////////////////////////////////////////////
// See readme.txt for more details                             //
/////////////////////////////////////////////////////////////////
//                                                             //
// module.audio-video.quicktime.php                            //
// module for analyzing Quicktime and MP3-in-MP4 files         //
// dependencies: module.audio.mp3.php                          //
//                                                            ///
/////////////////////////////////////////////////////////////////

/**
 * module for analyzing Quicktime and MP3-in-MP4 files
 *
 * @author James Heinrich <info@getid3.org>
 *
 * @link http://getid3.sourceforge.net
 * @link http://www.getid3.org
 *
 * @uses Module\Audio\Mp3
 */
class Quicktime extends BaseHandler
{
    /**
     * @var bool
     */
    public $ReturnAtomData = true;
    /**
     * @var bool
     */
    public $ParseAllPossibleAtoms = false;

    /**
     * @return bool
     */
    public function analyze()
    {
        $info = &$this->getid3->info;

        $info['fileformat'] = 'quicktime';
        $info['quicktime']['hinting'] = false;
        $info['quicktime']['controller'] = 'standard'; // may be overridden if 'ctyp' atom is present

        fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);

        $offset = 0;
        $atomcounter = 0;

        while ($offset < $info['avdataend']) {
            if (!Helper::intValueSupported($offset)) {
                $info['error'][] = 'Unable to parse atom at offset '.$offset.' because beyond '.round(PHP_INT_MAX / 1073741824).'GB limit of PHP filesystem functions';
                break;
            }
            fseek($this->getid3->fp, $offset, SEEK_SET);
            $AtomHeader = fread($this->getid3->fp, 8);

            $atomsize = Helper::BigEndian2Int(substr($AtomHeader, 0, 4));
            $atomname = substr($AtomHeader, 4, 4);

            // 64-bit MOV patch by jlegateØktnc*com
            if ($atomsize == 1) {
                $atomsize = Helper::BigEndian2Int(fread($this->getid3->fp, 8));
            }

            $info['quicktime'][$atomname]['name'] = $atomname;
            $info['quicktime'][$atomname]['size'] = $atomsize;
            $info['quicktime'][$atomname]['offset'] = $offset;

            if (($offset + $atomsize) > $info['avdataend']) {
                $info['error'][] = 'Atom at offset '.$offset.' claims to go beyond end-of-file (length: '.$atomsize.' bytes)';

                return false;
            }

            if ($atomsize == 0) {
                // Furthermore, for historical reasons the list of atoms is optionally
                // terminated by a 32-bit integer set to 0. If you are writing a program
                // to read user data atoms, you should allow for the terminating 0.
                break;
            }
            switch ($atomname) {
                case 'mdat': // Media DATa atom
                    // 'mdat' contains the actual data for the audio/video
                    if (($atomsize > 8) && (!isset($info['avdataend_tmp']) || ($info['quicktime'][$atomname]['size'] > ($info['avdataend_tmp'] - $info['avdataoffset'])))) {
                        $info['avdataoffset'] = $info['quicktime'][$atomname]['offset'] + 8;
                        $OldAVDataEnd = $info['avdataend'];
                        $info['avdataend'] = $info['quicktime'][$atomname]['offset'] + $info['quicktime'][$atomname]['size'];

                        $getid3_temp = new GetId3Core();
                        $getid3_temp->openfile($this->getid3->filename);
                        $getid3_temp->info['avdataoffset'] = $info['avdataoffset'];
                        $getid3_temp->info['avdataend'] = $info['avdataend'];
                        $getid3_mp3 = new Module\Audio\Mp3($getid3_temp);
                        if ($getid3_mp3->MPEGaudioHeaderValid($getid3_mp3->MPEGaudioHeaderDecode(fread($this->getid3->fp, 4)))) {
                            $getid3_mp3->getOnlyMPEGaudioInfo($getid3_temp->info['avdataoffset'], false);
                            if (!empty($getid3_temp->info['warning'])) {
                                foreach ($getid3_temp->info['warning'] as $value) {
                                    $info['warning'][] = $value;
                                }
                            }
                            if (!empty($getid3_temp->info['mpeg'])) {
                                $info['mpeg'] = $getid3_temp->info['mpeg'];
                                if (isset($info['mpeg']['audio'])) {
                                    $info['audio']['dataformat'] = 'mp3';
                                    $info['audio']['codec'] = (!empty($info['mpeg']['audio']['encoder']) ? $info['mpeg']['audio']['encoder'] : (!empty($info['mpeg']['audio']['codec']) ? $info['mpeg']['audio']['codec'] : (!empty($info['mpeg']['audio']['LAME']) ? 'LAME' : 'mp3')));
                                    $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
                                    $info['audio']['channels'] = $info['mpeg']['audio']['channels'];
                                    $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
                                    $info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);
                                    $info['bitrate'] = $info['audio']['bitrate'];
                                }
                            }
                        }
                        unset($getid3_mp3, $getid3_temp);
                        $info['avdataend'] = $OldAVDataEnd;
                        unset($OldAVDataEnd);
                    }
                    break;

                case 'free': // FREE space atom
                case 'skip': // SKIP atom
                case 'wide': // 64-bit expansion placeholder atom
                    // 'free', 'skip' and 'wide' are just padding, contains no useful data at all
                    break;

                default:
                    $atomHierarchy = array();
                    $info['quicktime'][$atomname] = $this->QuicktimeParseAtom($atomname, $atomsize, fread($this->getid3->fp, $atomsize), $offset, $atomHierarchy, $this->ParseAllPossibleAtoms);
                    break;
            }

            $offset += $atomsize;
            ++$atomcounter;
        }

        if (!empty($info['avdataend_tmp'])) {
            // this value is assigned to a temp value and then erased because
            // otherwise any atoms beyond the 'mdat' atom would not get parsed
            $info['avdataend'] = $info['avdataend_tmp'];
            unset($info['avdataend_tmp']);
        }

        if (!isset($info['bitrate']) && isset($info['playtime_seconds'])) {
            $info['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
        }
        if (isset($info['bitrate']) && !isset($info['audio']['bitrate']) && !isset($info['quicktime']['video'])) {
            $info['audio']['bitrate'] = $info['bitrate'];
        }
        if (!empty($info['playtime_seconds']) && !isset($info['video']['frame_rate']) && !empty($info['quicktime']['stts_framecount'])) {
            foreach ($info['quicktime']['stts_framecount'] as $key => $samples_count) {
                $samples_per_second = $samples_count / $info['playtime_seconds'];
                if ($samples_per_second > 240) {
                    // has to be audio samples
                } else {
                    $info['video']['frame_rate'] = $samples_per_second;
                    break;
                }
            }
        }
        if (($info['audio']['dataformat'] == 'mp4') && empty($info['video']['resolution_x'])) {
            $info['fileformat'] = 'mp4';
            $info['mime_type'] = 'audio/mp4';
            unset($info['video']['dataformat']);
        }

        if (!$this->ReturnAtomData) {
            unset($info['quicktime']['moov']);
        }

        if (empty($info['audio']['dataformat']) && !empty($info['quicktime']['audio'])) {
            $info['audio']['dataformat'] = 'quicktime';
        }
        if (empty($info['video']['dataformat']) && !empty($info['quicktime']['video'])) {
            $info['video']['dataformat'] = 'quicktime';
        }

        return true;
    }

    /**
     * @param  type    $atomname
     * @param  type    $atomsize
     * @param  type    $atom_data
     * @param  type    $baseoffset
     * @param  type    $atomHierarchy
     * @param  type    $ParseAllPossibleAtoms
     *
     * @return bool
     *
     * @link http://developer.apple.com/techpubs/quicktime/qtdevdocs/APIREF/INDEX/atomalphaindex.htm
     */
    public function QuicktimeParseAtom($atomname, $atomsize, $atom_data, $baseoffset, &$atomHierarchy, $ParseAllPossibleAtoms)
    {
        $info = &$this->getid3->info;

        $atom_parent = array_pop($atomHierarchy);
        array_push($atomHierarchy, $atomname);
        $atom_structure['hierarchy'] = implode(' ', $atomHierarchy);
        $atom_structure['name'] = $atomname;
        $atom_structure['size'] = $atomsize;
        $atom_structure['offset'] = $baseoffset;
//echo GetId3_lib::PrintHexBytes(substr($atom_data, 0, 8)).'<br>';
//echo GetId3_lib::PrintHexBytes(substr($atom_data, 0, 8), false).'<br><br>';
        switch ($atomname) {
            case 'moov': // MOVie container atom
            case 'trak': // TRAcK container atom
            case 'clip': // CLIPping container atom
            case 'matt': // track MATTe container atom
            case 'edts': // EDiTS container atom
            case 'tref': // Track REFerence container atom
            case 'mdia': // MeDIA container atom
            case 'minf': // Media INFormation container atom
            case 'dinf': // Data INFormation container atom
            case 'udta': // User DaTA container atom
            case 'cmov': // Compressed MOVie container atom
            case 'rmra': // Reference Movie Record Atom
            case 'rmda': // Reference Movie Descriptor Atom
            case 'gmhd': // Generic Media info HeaDer atom (seen on QTVR)
                $atom_structure['subatoms'] = $this->QuicktimeParseContainerAtom($atom_data, $baseoffset + 8, $atomHierarchy, $ParseAllPossibleAtoms);
                break;

            case 'ilst': // Item LiST container atom
                $atom_structure['subatoms'] = $this->QuicktimeParseContainerAtom($atom_data, $baseoffset + 8, $atomHierarchy, $ParseAllPossibleAtoms);

                // some "ilst" atoms contain data atoms that have a numeric name, and the data is far more accessible if the returned array is compacted
                $allnumericnames = true;
                foreach ($atom_structure['subatoms'] as $subatomarray) {
                    if (!is_int($subatomarray['name']) || (count($subatomarray['subatoms']) != 1)) {
                        $allnumericnames = false;
                        break;
                    }
                }
                if ($allnumericnames) {
                    $newData = array();
                    foreach ($atom_structure['subatoms'] as $subatomarray) {
                        foreach ($subatomarray['subatoms'] as $newData_subatomarray) {
                            unset($newData_subatomarray['hierarchy'], $newData_subatomarray['name']);
                            $newData[$subatomarray['name']] = $newData_subatomarray;
                            break;
                        }
                    }
                    $atom_structure['data'] = $newData;
                    unset($atom_structure['subatoms']);
                }
                break;

            case "\x00\x00\x00\x01":
            case "\x00\x00\x00\x02":
            case "\x00\x00\x00\x03":
            case "\x00\x00\x00\x04":
            case "\x00\x00\x00\x05":
                $atomname = Helper::BigEndian2Int($atomname);
                $atom_structure['name'] = $atomname;
                $atom_structure['subatoms'] = $this->QuicktimeParseContainerAtom($atom_data, $baseoffset + 8, $atomHierarchy, $ParseAllPossibleAtoms);
                break;

            case 'stbl': // Sample TaBLe container atom
                $atom_structure['subatoms'] = $this->QuicktimeParseContainerAtom($atom_data, $baseoffset + 8, $atomHierarchy, $ParseAllPossibleAtoms);
                $isVideo = false;
                $framerate = 0;
                $framecount = 0;
                foreach ($atom_structure['subatoms'] as $key => $value_array) {
                    if (isset($value_array['sample_description_table'])) {
                        foreach ($value_array['sample_description_table'] as $key2 => $value_array2) {
                            if (isset($value_array2['data_format'])) {
                                switch ($value_array2['data_format']) {
                                    case 'avc1':
                                    case 'mp4v':
                                        // video data
                                        $isVideo = true;
                                        break;
                                    case 'mp4a':
                                        // audio data
                                        break;
                                }
                            }
                        }
                    } elseif (isset($value_array['time_to_sample_table'])) {
                        foreach ($value_array['time_to_sample_table'] as $key2 => $value_array2) {
                            if (isset($value_array2['sample_count']) && isset($value_array2['sample_duration']) && ($value_array2['sample_duration'] > 0)) {
                                $framerate = round($info['quicktime']['time_scale'] / $value_array2['sample_duration'], 3);
                                $framecount = $value_array2['sample_count'];
                            }
                        }
                    }
                }
                if ($isVideo && $framerate) {
                    $info['quicktime']['video']['frame_rate'] = $framerate;
                    $info['video']['frame_rate'] = $info['quicktime']['video']['frame_rate'];
                }
                if ($isVideo && $framecount) {
                    $info['quicktime']['video']['frame_count'] = $framecount;
                }
                break;

            case 'aART': // Album ARTist
            case 'catg': // CaTeGory
            case 'covr': // COVeR artwork
            case 'cpil': // ComPILation
            case 'cprt': // CoPyRighT
            case 'desc': // DESCription
            case 'disk': // DISK number
            case 'egid': // Episode Global ID
            case 'gnre': // GeNRE
            case 'keyw': // KEYWord
            case 'ldes':
            case 'pcst': // PodCaST
            case 'pgap': // GAPless Playback
            case 'purd': // PURchase Date
            case 'purl': // Podcast URL
            case 'rati':
            case 'rndu':
            case 'rpdu':
            case 'rtng': // RaTiNG
            case 'stik':
            case 'tmpo': // TeMPO (BPM)
            case 'trkn': // TRacK Number
            case 'tves': // TV EpiSode
            case 'tvnn': // TV Network Name
            case 'tvsh': // TV SHow Name
            case 'tvsn': // TV SeasoN
            case 'akID': // iTunes store account type
            case 'apID':
            case 'atID':
            case 'cmID':
            case 'cnID':
            case 'geID':
            case 'plID':
            case 'sfID': // iTunes store country
            case '©alb': // ALBum
            case '©art': // ARTist
            case '©ART':
            case '©aut':
            case '©cmt': // CoMmenT
            case '©com': // COMposer
            case '©cpy':
            case '©day': // content created year
            case '©dir':
            case '©ed1':
            case '©ed2':
            case '©ed3':
            case '©ed4':
            case '©ed5':
            case '©ed6':
            case '©ed7':
            case '©ed8':
            case '©ed9':
            case '©enc':
            case '©fmt':
            case '©gen': // GENre
            case '©grp': // GRouPing
            case '©hst':
            case '©inf':
            case '©lyr': // LYRics
            case '©mak':
            case '©mod':
            case '©nam': // full NAMe
            case '©ope':
            case '©PRD':
            case '©prd':
            case '©prf':
            case '©req':
            case '©src':
            case '©swr':
            case '©too': // encoder
            case '©trk': // TRacK
            case '©url':
            case '©wrn':
            case '©wrt': // WRiTer
            case '----': // itunes specific
                if ($atom_parent == 'udta') {
                    // User data atom handler
                    $atom_structure['data_length'] = Helper::BigEndian2Int(substr($atom_data, 0, 2));
                    $atom_structure['language_id'] = Helper::BigEndian2Int(substr($atom_data, 2, 2));
                    $atom_structure['data'] = substr($atom_data, 4);

                    $atom_structure['language'] = $this->QuicktimeLanguageLookup($atom_structure['language_id']);
                    if (empty($info['comments']['language']) || (!in_array($atom_structure['language'], $info['comments']['language']))) {
                        $info['comments']['language'][] = $atom_structure['language'];
                    }
                } else {
                    // Apple item list box atom handler
                    $atomoffset = 0;
                    if (substr($atom_data, 2, 2) == "\x10\xB5") {
                        // not sure what it means, but observed on iPhone4 data.
                        // Each $atom_data has 2 bytes of datasize, plus 0x10B5, then data
                        while ($atomoffset < strlen($atom_data)) {
                            $boxsmallsize = Helper::BigEndian2Int(substr($atom_data, $atomoffset, 2));
                            $boxsmalltype = substr($atom_data, $atomoffset + 2, 2);
                            $boxsmalldata = substr($atom_data, $atomoffset + 4, $boxsmallsize);
                            switch ($boxsmalltype) {
                                case "\x10\xB5":
                                    $atom_structure['data'] = $boxsmalldata;
                                    break;
                                default:
                                    $info['warning'][] = 'Unknown QuickTime smallbox type: "'.Helper::PrintHexBytes($boxsmalltype).'" at offset '.$baseoffset;
                                    $atom_structure['data'] = $atom_data;
                                    break;
                            }
                            $atomoffset += (4 + $boxsmallsize);
                        }
                    } else {
                        while ($atomoffset < strlen($atom_data)) {
                            $boxsize = Helper::BigEndian2Int(substr($atom_data, $atomoffset, 4));
                            $boxtype = substr($atom_data, $atomoffset + 4, 4);
                            $boxdata = substr($atom_data, $atomoffset + 8, $boxsize - 8);
                            if ($boxsize <= 1) {
                                $info['warning'][] = 'Invalid QuickTime atom box size "'.$boxsize.'" in atom "'.$atomname.'" at offset: '.($atom_structure['offset'] + $atomoffset);
                                $atom_structure['data'] = null;
                                $atomoffset = strlen($atom_data);
                                break;
                            }
                            $atomoffset += $boxsize;

                            switch ($boxtype) {
                                case 'mean':
                                case 'name':
                                    $atom_structure[$boxtype] = substr($boxdata, 4);
                                    break;

                                case 'data':
                                    $atom_structure['version'] = Helper::BigEndian2Int(substr($boxdata, 0, 1));
                                    $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($boxdata, 1, 3));
                                    switch ($atom_structure['flags_raw']) {
                                        case 0:  // data flag
                                        case 21: // tmpo/cpil flag
                                            switch ($atomname) {
                                                case 'cpil':
                                                case 'pcst':
                                                case 'pgap':
                                                    $atom_structure['data'] = Helper::BigEndian2Int(substr($boxdata, 8, 1));
                                                    break;

                                                case 'tmpo':
                                                    $atom_structure['data'] = Helper::BigEndian2Int(substr($boxdata, 8, 2));
                                                    break;

                                                case 'disk':
                                                case 'trkn':
                                                    $num = Helper::BigEndian2Int(substr($boxdata, 10, 2));
                                                    $num_total = Helper::BigEndian2Int(substr($boxdata, 12, 2));
                                                    $atom_structure['data'] = empty($num) ? '' : $num;
                                                    $atom_structure['data'] .= empty($num_total) ? '' : '/'.$num_total;
                                                    break;

                                                case 'gnre':
                                                    $GenreID = Helper::BigEndian2Int(substr($boxdata, 8, 4));
                                                    $atom_structure['data'] = Module\Tag\Id3v1::LookupGenreName($GenreID - 1);
                                                    break;

                                                case 'rtng':
                                                    $atom_structure[$atomname] = Helper::BigEndian2Int(substr($boxdata, 8, 1));
                                                    $atom_structure['data'] = $this->QuicktimeContentRatingLookup($atom_structure[$atomname]);
                                                    break;

                                                case 'stik':
                                                    $atom_structure[$atomname] = Helper::BigEndian2Int(substr($boxdata, 8, 1));
                                                    $atom_structure['data'] = $this->QuicktimeSTIKLookup($atom_structure[$atomname]);
                                                    break;

                                                case 'sfID':
                                                    $atom_structure[$atomname] = Helper::BigEndian2Int(substr($boxdata, 8, 4));
                                                    $atom_structure['data'] = $this->QuicktimeStoreFrontCodeLookup($atom_structure[$atomname]);
                                                    break;

                                                case 'egid':
                                                case 'purl':
                                                    $atom_structure['data'] = substr($boxdata, 8);
                                                    break;

                                                default:
                                                    $atom_structure['data'] = Helper::BigEndian2Int(substr($boxdata, 8, 4));
                                            }
                                            break;

                                        case 1:  // text flag
                                        case 13: // image flag
                                        default:
                                            $atom_structure['data'] = substr($boxdata, 8);
                                            break;

                                    }
                                    break;

                                default:
                                    $info['warning'][] = 'Unknown QuickTime box type: "'.Helper::PrintHexBytes($boxtype).'" at offset '.$baseoffset;
                                    $atom_structure['data'] = $atom_data;

                            }
                        }
                    }
                }
                $this->CopyToAppropriateCommentsSection($atomname, $atom_structure['data'], $atom_structure['name']);
                break;

            case 'play': // auto-PLAY atom
                $atom_structure['autoplay'] = (bool) Helper::BigEndian2Int(substr($atom_data, 0, 1));

                $info['quicktime']['autoplay'] = $atom_structure['autoplay'];
                break;

            case 'WLOC': // Window LOCation atom
                $atom_structure['location_x'] = Helper::BigEndian2Int(substr($atom_data, 0, 2));
                $atom_structure['location_y'] = Helper::BigEndian2Int(substr($atom_data, 2, 2));
                break;

            case 'LOOP': // LOOPing atom
            case 'SelO': // play SELection Only atom
            case 'AllF': // play ALL Frames atom
                $atom_structure['data'] = Helper::BigEndian2Int($atom_data);
                break;

            case 'name': //
            case 'MCPS': // Media Cleaner PRo
            case '@PRM': // adobe PReMiere version
            case '@PRQ': // adobe PRemiere Quicktime version
                $atom_structure['data'] = $atom_data;
                break;

            case 'cmvd': // Compressed MooV Data atom
                // Code by ubergeekØubergeek*tv based on information from
                // http://developer.apple.com/quicktime/icefloe/dispatch012.html
                $atom_structure['unCompressedSize'] = Helper::BigEndian2Int(substr($atom_data, 0, 4));

                $CompressedFileData = substr($atom_data, 4);
                if ($UncompressedHeader = @gzuncompress($CompressedFileData)) {
                    $atom_structure['subatoms'] = $this->QuicktimeParseContainerAtom($UncompressedHeader, 0, $atomHierarchy, $ParseAllPossibleAtoms);
                } else {
                    $info['warning'][] = 'Error decompressing compressed MOV atom at offset '.$atom_structure['offset'];
                }
                break;

            case 'dcom': // Data COMpression atom
                $atom_structure['compression_id'] = $atom_data;
                $atom_structure['compression_text'] = $this->QuicktimeDCOMLookup($atom_data);
                break;

            case 'rdrf': // Reference movie Data ReFerence atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3));
                $atom_structure['flags']['internal_data'] = (bool) ($atom_structure['flags_raw'] & 0x000001);

                $atom_structure['reference_type_name'] = substr($atom_data, 4, 4);
                $atom_structure['reference_length'] = Helper::BigEndian2Int(substr($atom_data, 8, 4));
                switch ($atom_structure['reference_type_name']) {
                    case 'url ':
                        $atom_structure['url'] = $this->NoNullString(substr($atom_data, 12));
                        break;

                    case 'alis':
                        $atom_structure['file_alias'] = substr($atom_data, 12);
                        break;

                    case 'rsrc':
                        $atom_structure['resource_alias'] = substr($atom_data, 12);
                        break;

                    default:
                        $atom_structure['data'] = substr($atom_data, 12);
                        break;
                }
                break;

            case 'rmqu': // Reference Movie QUality atom
                $atom_structure['movie_quality'] = Helper::BigEndian2Int($atom_data);
                break;

            case 'rmcs': // Reference Movie Cpu Speed atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                $atom_structure['cpu_speed_rating'] = Helper::BigEndian2Int(substr($atom_data, 4, 2));
                break;

            case 'rmvc': // Reference Movie Version Check atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                $atom_structure['gestalt_selector'] = substr($atom_data, 4, 4);
                $atom_structure['gestalt_value_mask'] = Helper::BigEndian2Int(substr($atom_data, 8, 4));
                $atom_structure['gestalt_value'] = Helper::BigEndian2Int(substr($atom_data, 12, 4));
                $atom_structure['gestalt_check_type'] = Helper::BigEndian2Int(substr($atom_data, 14, 2));
                break;

            case 'rmcd': // Reference Movie Component check atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                $atom_structure['component_type'] = substr($atom_data, 4, 4);
                $atom_structure['component_subtype'] = substr($atom_data, 8, 4);
                $atom_structure['component_manufacturer'] = substr($atom_data, 12, 4);
                $atom_structure['component_flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 16, 4));
                $atom_structure['component_flags_mask'] = Helper::BigEndian2Int(substr($atom_data, 20, 4));
                $atom_structure['component_min_version'] = Helper::BigEndian2Int(substr($atom_data, 24, 4));
                break;

            case 'rmdr': // Reference Movie Data Rate atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                $atom_structure['data_rate'] = Helper::BigEndian2Int(substr($atom_data, 4, 4));

                $atom_structure['data_rate_bps'] = $atom_structure['data_rate'] * 10;
                break;

            case 'rmla': // Reference Movie Language Atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                $atom_structure['language_id'] = Helper::BigEndian2Int(substr($atom_data, 4, 2));

                $atom_structure['language'] = $this->QuicktimeLanguageLookup($atom_structure['language_id']);
                if (empty($info['comments']['language']) || (!in_array($atom_structure['language'], $info['comments']['language']))) {
                    $info['comments']['language'][] = $atom_structure['language'];
                }
                break;

            case 'rmla': // Reference Movie Language Atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                $atom_structure['track_id'] = Helper::BigEndian2Int(substr($atom_data, 4, 2));
                break;

            case 'ptv ': // Print To Video - defines a movie's full screen mode
                // http://developer.apple.com/documentation/QuickTime/APIREF/SOURCESIV/at_ptv-_pg.htm
                $atom_structure['display_size_raw'] = Helper::BigEndian2Int(substr($atom_data, 0, 2));
                $atom_structure['reserved_1'] = Helper::BigEndian2Int(substr($atom_data, 2, 2)); // hardcoded: 0x0000
                $atom_structure['reserved_2'] = Helper::BigEndian2Int(substr($atom_data, 4, 2)); // hardcoded: 0x0000
                $atom_structure['slide_show_flag'] = Helper::BigEndian2Int(substr($atom_data, 6, 1));
                $atom_structure['play_on_open_flag'] = Helper::BigEndian2Int(substr($atom_data, 7, 1));

                $atom_structure['flags']['play_on_open'] = (bool) $atom_structure['play_on_open_flag'];
                $atom_structure['flags']['slide_show'] = (bool) $atom_structure['slide_show_flag'];

                $ptv_lookup[0] = 'normal';
                $ptv_lookup[1] = 'double';
                $ptv_lookup[2] = 'half';
                $ptv_lookup[3] = 'full';
                $ptv_lookup[4] = 'current';
                if (isset($ptv_lookup[$atom_structure['display_size_raw']])) {
                    $atom_structure['display_size'] = $ptv_lookup[$atom_structure['display_size_raw']];
                } else {
                    $info['warning'][] = 'unknown "ptv " display constant ('.$atom_structure['display_size_raw'].')';
                }
                break;

            case 'stsd': // Sample Table Sample Description atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                $atom_structure['number_entries'] = Helper::BigEndian2Int(substr($atom_data, 4, 4));
                $stsdEntriesDataOffset = 8;
                for ($i = 0; $i < $atom_structure['number_entries']; ++$i) {
                    $atom_structure['sample_description_table'][$i]['size'] = Helper::BigEndian2Int(substr($atom_data, $stsdEntriesDataOffset, 4));
                    $stsdEntriesDataOffset += 4;
                    $atom_structure['sample_description_table'][$i]['data_format'] = substr($atom_data, $stsdEntriesDataOffset, 4);
                    $stsdEntriesDataOffset += 4;
                    $atom_structure['sample_description_table'][$i]['reserved'] = Helper::BigEndian2Int(substr($atom_data, $stsdEntriesDataOffset, 6));
                    $stsdEntriesDataOffset += 6;
                    $atom_structure['sample_description_table'][$i]['reference_index'] = Helper::BigEndian2Int(substr($atom_data, $stsdEntriesDataOffset, 2));
                    $stsdEntriesDataOffset += 2;
                    $atom_structure['sample_description_table'][$i]['data'] = substr($atom_data, $stsdEntriesDataOffset, ($atom_structure['sample_description_table'][$i]['size'] - 4 - 4 - 6 - 2));
                    $stsdEntriesDataOffset += ($atom_structure['sample_description_table'][$i]['size'] - 4 - 4 - 6 - 2);

                    $atom_structure['sample_description_table'][$i]['encoder_version'] = Helper::BigEndian2Int(substr($atom_structure['sample_description_table'][$i]['data'], 0, 2));
                    $atom_structure['sample_description_table'][$i]['encoder_revision'] = Helper::BigEndian2Int(substr($atom_structure['sample_description_table'][$i]['data'], 2, 2));
                    $atom_structure['sample_description_table'][$i]['encoder_vendor'] = substr($atom_structure['sample_description_table'][$i]['data'], 4, 4);

                    switch ($atom_structure['sample_description_table'][$i]['encoder_vendor']) {

                        case "\x00\x00\x00\x00":
                            // audio atom
                            $atom_structure['sample_description_table'][$i]['audio_channels'] = Helper::BigEndian2Int(substr($atom_structure['sample_description_table'][$i]['data'], 8, 2));
                            $atom_structure['sample_description_table'][$i]['audio_bit_depth'] = Helper::BigEndian2Int(substr($atom_structure['sample_description_table'][$i]['data'], 10, 2));
                            $atom_structure['sample_description_table'][$i]['audio_compression_id'] = Helper::BigEndian2Int(substr($atom_structure['sample_description_table'][$i]['data'], 12, 2));
                            $atom_structure['sample_description_table'][$i]['audio_packet_size'] = Helper::BigEndian2Int(substr($atom_structure['sample_description_table'][$i]['data'], 14, 2));
                            $atom_structure['sample_description_table'][$i]['audio_sample_rate'] = Helper::FixedPoint16_16(substr($atom_structure['sample_description_table'][$i]['data'], 16, 4));

                            switch ($atom_structure['sample_description_table'][$i]['data_format']) {
                                case 'avc1':
                                case 'mp4v':
                                    $info['fileformat'] = 'mp4';
                                    $info['video']['fourcc'] = $atom_structure['sample_description_table'][$i]['data_format'];
                                    //$info['warning'][] = 'This version of GetId3Core() ['.$this->getid3->version().'] does not fully support MPEG-4 audio/video streams'; // 2011-02-18: why am I warning about this again? What's not supported?
                                    break;

                                case 'qtvr':
                                    $info['video']['dataformat'] = 'quicktimevr';
                                    break;

                                case 'mp4a':
                                default:
                                    $info['quicktime']['audio']['codec'] = $this->QuicktimeAudioCodecLookup($atom_structure['sample_description_table'][$i]['data_format']);
                                    $info['quicktime']['audio']['sample_rate'] = $atom_structure['sample_description_table'][$i]['audio_sample_rate'];
                                    $info['quicktime']['audio']['channels'] = $atom_structure['sample_description_table'][$i]['audio_channels'];
                                    $info['quicktime']['audio']['bit_depth'] = $atom_structure['sample_description_table'][$i]['audio_bit_depth'];
                                    $info['audio']['codec'] = $info['quicktime']['audio']['codec'];
                                    $info['audio']['sample_rate'] = $info['quicktime']['audio']['sample_rate'];
                                    $info['audio']['channels'] = $info['quicktime']['audio']['channels'];
                                    $info['audio']['bits_per_sample'] = $info['quicktime']['audio']['bit_depth'];
                                    switch ($atom_structure['sample_description_table'][$i]['data_format']) {
                                        case 'raw ': // PCM
                                        case 'alac': // Apple Lossless Audio Codec
                                            $info['audio']['lossless'] = true;
                                            break;
                                        default:
                                            $info['audio']['lossless'] = false;
                                            break;
                                    }
                                    break;
                            }
                            break;

                        default:
                            switch ($atom_structure['sample_description_table'][$i]['data_format']) {
                                case 'mp4s':
                                    $info['fileformat'] = 'mp4';
                                    break;

                                default:
                                    // video atom
                                    $atom_structure['sample_description_table'][$i]['video_temporal_quality'] = Helper::BigEndian2Int(substr($atom_structure['sample_description_table'][$i]['data'], 8, 4));
                                    $atom_structure['sample_description_table'][$i]['video_spatial_quality'] = Helper::BigEndian2Int(substr($atom_structure['sample_description_table'][$i]['data'], 12, 4));
                                    $atom_structure['sample_description_table'][$i]['video_frame_width'] = Helper::BigEndian2Int(substr($atom_structure['sample_description_table'][$i]['data'], 16, 2));
                                    $atom_structure['sample_description_table'][$i]['video_frame_height'] = Helper::BigEndian2Int(substr($atom_structure['sample_description_table'][$i]['data'], 18, 2));
                                    $atom_structure['sample_description_table'][$i]['video_resolution_x'] = Helper::FixedPoint16_16(substr($atom_structure['sample_description_table'][$i]['data'], 20, 4));
                                    $atom_structure['sample_description_table'][$i]['video_resolution_y'] = Helper::FixedPoint16_16(substr($atom_structure['sample_description_table'][$i]['data'], 24, 4));
                                    $atom_structure['sample_description_table'][$i]['video_data_size'] = Helper::BigEndian2Int(substr($atom_structure['sample_description_table'][$i]['data'], 28, 4));
                                    $atom_structure['sample_description_table'][$i]['video_frame_count'] = Helper::BigEndian2Int(substr($atom_structure['sample_description_table'][$i]['data'], 32, 2));
                                    $atom_structure['sample_description_table'][$i]['video_encoder_name_len'] = Helper::BigEndian2Int(substr($atom_structure['sample_description_table'][$i]['data'], 34, 1));
                                    $atom_structure['sample_description_table'][$i]['video_encoder_name'] = substr($atom_structure['sample_description_table'][$i]['data'], 35, $atom_structure['sample_description_table'][$i]['video_encoder_name_len']);
                                    $atom_structure['sample_description_table'][$i]['video_pixel_color_depth'] = Helper::BigEndian2Int(substr($atom_structure['sample_description_table'][$i]['data'], 66, 2));
                                    $atom_structure['sample_description_table'][$i]['video_color_table_id'] = Helper::BigEndian2Int(substr($atom_structure['sample_description_table'][$i]['data'], 68, 2));

                                    $atom_structure['sample_description_table'][$i]['video_pixel_color_type'] = (($atom_structure['sample_description_table'][$i]['video_pixel_color_depth'] > 32) ? 'grayscale' : 'color');
                                    $atom_structure['sample_description_table'][$i]['video_pixel_color_name'] = $this->QuicktimeColorNameLookup($atom_structure['sample_description_table'][$i]['video_pixel_color_depth']);

                                    if ($atom_structure['sample_description_table'][$i]['video_pixel_color_name'] != 'invalid') {
                                        $info['quicktime']['video']['codec_fourcc'] = $atom_structure['sample_description_table'][$i]['data_format'];
                                        $info['quicktime']['video']['codec_fourcc_lookup'] = $this->QuicktimeVideoCodecLookup($atom_structure['sample_description_table'][$i]['data_format']);
                                        $info['quicktime']['video']['codec'] = (($atom_structure['sample_description_table'][$i]['video_encoder_name_len'] > 0) ? $atom_structure['sample_description_table'][$i]['video_encoder_name'] : $atom_structure['sample_description_table'][$i]['data_format']);
                                        $info['quicktime']['video']['color_depth'] = $atom_structure['sample_description_table'][$i]['video_pixel_color_depth'];
                                        $info['quicktime']['video']['color_depth_name'] = $atom_structure['sample_description_table'][$i]['video_pixel_color_name'];

                                        $info['video']['codec'] = $info['quicktime']['video']['codec'];
                                        $info['video']['bits_per_sample'] = $info['quicktime']['video']['color_depth'];
                                    }
                                    $info['video']['lossless'] = false;
                                    $info['video']['pixel_aspect_ratio'] = (float) 1;
                                    break;
                            }
                            break;
                    }
                    switch (strtolower($atom_structure['sample_description_table'][$i]['data_format'])) {
                        case 'mp4a':
                            $info['audio']['dataformat'] = 'mp4';
                            $info['quicktime']['audio']['codec'] = 'mp4';
                            break;

                        case '3ivx':
                        case '3iv1':
                        case '3iv2':
                            $info['video']['dataformat'] = '3ivx';
                            break;

                        case 'xvid':
                            $info['video']['dataformat'] = 'xvid';
                            break;

                        case 'mp4v':
                            $info['video']['dataformat'] = 'mpeg4';
                            break;

                        case 'divx':
                        case 'div1':
                        case 'div2':
                        case 'div3':
                        case 'div4':
                        case 'div5':
                        case 'div6':
                            $info['video']['dataformat'] = 'divx';
                            break;

                        default:
                            // do nothing
                            break;
                    }
                    unset($atom_structure['sample_description_table'][$i]['data']);
                }
                break;

            case 'stts': // Sample Table Time-to-Sample atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                $atom_structure['number_entries'] = Helper::BigEndian2Int(substr($atom_data, 4, 4));
                $sttsEntriesDataOffset = 8;
                //$FrameRateCalculatorArray = array();
                $frames_count = 0;
                for ($i = 0; $i < $atom_structure['number_entries']; ++$i) {
                    $atom_structure['time_to_sample_table'][$i]['sample_count'] = Helper::BigEndian2Int(substr($atom_data, $sttsEntriesDataOffset, 4));
                    $sttsEntriesDataOffset += 4;
                    $atom_structure['time_to_sample_table'][$i]['sample_duration'] = Helper::BigEndian2Int(substr($atom_data, $sttsEntriesDataOffset, 4));
                    $sttsEntriesDataOffset += 4;

                    $frames_count += $atom_structure['time_to_sample_table'][$i]['sample_count'];

                    // THIS SECTION REPLACED WITH CODE IN "stbl" ATOM
                    //if (!empty($info['quicktime']['time_scale']) && ($atom_structure['time_to_sample_table'][$i]['sample_duration'] > 0)) {
                    //	$stts_new_framerate = $info['quicktime']['time_scale'] / $atom_structure['time_to_sample_table'][$i]['sample_duration'];
                    //	if ($stts_new_framerate <= 60) {
                    //		// some atoms have durations of "1" giving a very large framerate, which probably is not right
                    //		$info['video']['frame_rate'] = max($info['video']['frame_rate'], $stts_new_framerate);
                    //	}
                    //}
                    //
                    //$FrameRateCalculatorArray[($info['quicktime']['time_scale'] / $atom_structure['time_to_sample_table'][$i]['sample_duration'])] += $atom_structure['time_to_sample_table'][$i]['sample_count'];
                }
                $info['quicktime']['stts_framecount'][] = $frames_count;
                //$sttsFramesTotal  = 0;
                //$sttsSecondsTotal = 0;
                //foreach ($FrameRateCalculatorArray as $frames_per_second => $frame_count) {
                //	if (($frames_per_second > 60) || ($frames_per_second < 1)) {
                //		// not video FPS information, probably audio information
                //		$sttsFramesTotal  = 0;
                //		$sttsSecondsTotal = 0;
                //		break;
                //	}
                //	$sttsFramesTotal  += $frame_count;
                //	$sttsSecondsTotal += $frame_count / $frames_per_second;
                //}
                //if (($sttsFramesTotal > 0) && ($sttsSecondsTotal > 0)) {
                //	if (($sttsFramesTotal / $sttsSecondsTotal) > $info['video']['frame_rate']) {
                //		$info['video']['frame_rate'] = $sttsFramesTotal / $sttsSecondsTotal;
                //	}
                //}
                break;

            case 'stss': // Sample Table Sync Sample (key frames) atom
                if ($ParseAllPossibleAtoms) {
                    $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                    $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                    $atom_structure['number_entries'] = Helper::BigEndian2Int(substr($atom_data, 4, 4));
                    $stssEntriesDataOffset = 8;
                    for ($i = 0; $i < $atom_structure['number_entries']; ++$i) {
                        $atom_structure['time_to_sample_table'][$i] = Helper::BigEndian2Int(substr($atom_data, $stssEntriesDataOffset, 4));
                        $stssEntriesDataOffset += 4;
                    }
                }
                break;

            case 'stsc': // Sample Table Sample-to-Chunk atom
                if ($ParseAllPossibleAtoms) {
                    $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                    $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                    $atom_structure['number_entries'] = Helper::BigEndian2Int(substr($atom_data, 4, 4));
                    $stscEntriesDataOffset = 8;
                    for ($i = 0; $i < $atom_structure['number_entries']; ++$i) {
                        $atom_structure['sample_to_chunk_table'][$i]['first_chunk'] = Helper::BigEndian2Int(substr($atom_data, $stscEntriesDataOffset, 4));
                        $stscEntriesDataOffset += 4;
                        $atom_structure['sample_to_chunk_table'][$i]['samples_per_chunk'] = Helper::BigEndian2Int(substr($atom_data, $stscEntriesDataOffset, 4));
                        $stscEntriesDataOffset += 4;
                        $atom_structure['sample_to_chunk_table'][$i]['sample_description'] = Helper::BigEndian2Int(substr($atom_data, $stscEntriesDataOffset, 4));
                        $stscEntriesDataOffset += 4;
                    }
                }
                break;

            case 'stsz': // Sample Table SiZe atom
                if ($ParseAllPossibleAtoms) {
                    $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                    $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                    $atom_structure['sample_size'] = Helper::BigEndian2Int(substr($atom_data, 4, 4));
                    $atom_structure['number_entries'] = Helper::BigEndian2Int(substr($atom_data, 8, 4));
                    $stszEntriesDataOffset = 12;
                    if ($atom_structure['sample_size'] == 0) {
                        for ($i = 0; $i < $atom_structure['number_entries']; ++$i) {
                            $atom_structure['sample_size_table'][$i] = Helper::BigEndian2Int(substr($atom_data, $stszEntriesDataOffset, 4));
                            $stszEntriesDataOffset += 4;
                        }
                    }
                }
                break;

            case 'stco': // Sample Table Chunk Offset atom
                if ($ParseAllPossibleAtoms) {
                    $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                    $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                    $atom_structure['number_entries'] = Helper::BigEndian2Int(substr($atom_data, 4, 4));
                    $stcoEntriesDataOffset = 8;
                    for ($i = 0; $i < $atom_structure['number_entries']; ++$i) {
                        $atom_structure['chunk_offset_table'][$i] = Helper::BigEndian2Int(substr($atom_data, $stcoEntriesDataOffset, 4));
                        $stcoEntriesDataOffset += 4;
                    }
                }
                break;

            case 'co64': // Chunk Offset 64-bit (version of "stco" that supports > 2GB files)
                if ($ParseAllPossibleAtoms) {
                    $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                    $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                    $atom_structure['number_entries'] = Helper::BigEndian2Int(substr($atom_data, 4, 4));
                    $stcoEntriesDataOffset = 8;
                    for ($i = 0; $i < $atom_structure['number_entries']; ++$i) {
                        $atom_structure['chunk_offset_table'][$i] = Helper::BigEndian2Int(substr($atom_data, $stcoEntriesDataOffset, 8));
                        $stcoEntriesDataOffset += 8;
                    }
                }
                break;

            case 'dref': // Data REFerence atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                $atom_structure['number_entries'] = Helper::BigEndian2Int(substr($atom_data, 4, 4));
                $drefDataOffset = 8;
                for ($i = 0; $i < $atom_structure['number_entries']; ++$i) {
                    $atom_structure['data_references'][$i]['size'] = Helper::BigEndian2Int(substr($atom_data, $drefDataOffset, 4));
                    $drefDataOffset += 4;
                    $atom_structure['data_references'][$i]['type'] = substr($atom_data, $drefDataOffset, 4);
                    $drefDataOffset += 4;
                    $atom_structure['data_references'][$i]['version'] = Helper::BigEndian2Int(substr($atom_data, $drefDataOffset, 1));
                    $drefDataOffset += 1;
                    $atom_structure['data_references'][$i]['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, $drefDataOffset, 3)); // hardcoded: 0x0000
                    $drefDataOffset += 3;
                    $atom_structure['data_references'][$i]['data'] = substr($atom_data, $drefDataOffset, ($atom_structure['data_references'][$i]['size'] - 4 - 4 - 1 - 3));
                    $drefDataOffset += ($atom_structure['data_references'][$i]['size'] - 4 - 4 - 1 - 3);

                    $atom_structure['data_references'][$i]['flags']['self_reference'] = (bool) ($atom_structure['data_references'][$i]['flags_raw'] & 0x001);
                }
                break;

            case 'gmin': // base Media INformation atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                $atom_structure['graphics_mode'] = Helper::BigEndian2Int(substr($atom_data, 4, 2));
                $atom_structure['opcolor_red'] = Helper::BigEndian2Int(substr($atom_data, 6, 2));
                $atom_structure['opcolor_green'] = Helper::BigEndian2Int(substr($atom_data, 8, 2));
                $atom_structure['opcolor_blue'] = Helper::BigEndian2Int(substr($atom_data, 10, 2));
                $atom_structure['balance'] = Helper::BigEndian2Int(substr($atom_data, 12, 2));
                $atom_structure['reserved'] = Helper::BigEndian2Int(substr($atom_data, 14, 2));
                break;

            case 'smhd': // Sound Media information HeaDer atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                $atom_structure['balance'] = Helper::BigEndian2Int(substr($atom_data, 4, 2));
                $atom_structure['reserved'] = Helper::BigEndian2Int(substr($atom_data, 6, 2));
                break;

            case 'vmhd': // Video Media information HeaDer atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3));
                $atom_structure['graphics_mode'] = Helper::BigEndian2Int(substr($atom_data, 4, 2));
                $atom_structure['opcolor_red'] = Helper::BigEndian2Int(substr($atom_data, 6, 2));
                $atom_structure['opcolor_green'] = Helper::BigEndian2Int(substr($atom_data, 8, 2));
                $atom_structure['opcolor_blue'] = Helper::BigEndian2Int(substr($atom_data, 10, 2));

                $atom_structure['flags']['no_lean_ahead'] = (bool) ($atom_structure['flags_raw'] & 0x001);
                break;

            case 'hdlr': // HanDLeR reference atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                $atom_structure['component_type'] = substr($atom_data, 4, 4);
                $atom_structure['component_subtype'] = substr($atom_data, 8, 4);
                $atom_structure['component_manufacturer'] = substr($atom_data, 12, 4);
                $atom_structure['component_flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 16, 4));
                $atom_structure['component_flags_mask'] = Helper::BigEndian2Int(substr($atom_data, 20, 4));
                $atom_structure['component_name'] = $this->Pascal2String(substr($atom_data, 24));

                if (($atom_structure['component_subtype'] == 'STpn') && ($atom_structure['component_manufacturer'] == 'zzzz')) {
                    $info['video']['dataformat'] = 'quicktimevr';
                }
                break;

            case 'mdhd': // MeDia HeaDer atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                $atom_structure['creation_time'] = Helper::BigEndian2Int(substr($atom_data, 4, 4));
                $atom_structure['modify_time'] = Helper::BigEndian2Int(substr($atom_data, 8, 4));
                $atom_structure['time_scale'] = Helper::BigEndian2Int(substr($atom_data, 12, 4));
                $atom_structure['duration'] = Helper::BigEndian2Int(substr($atom_data, 16, 4));
                $atom_structure['language_id'] = Helper::BigEndian2Int(substr($atom_data, 20, 2));
                $atom_structure['quality'] = Helper::BigEndian2Int(substr($atom_data, 22, 2));

                if ($atom_structure['time_scale'] == 0) {
                    $info['error'][] = 'Corrupt Quicktime file: mdhd.time_scale == zero';

                    return false;
                }
                $info['quicktime']['time_scale'] = (isset($info['quicktime']['time_scale']) ? max($info['quicktime']['time_scale'], $atom_structure['time_scale']) : $atom_structure['time_scale']);

                $atom_structure['creation_time_unix'] = Helper::DateMac2Unix($atom_structure['creation_time']);
                $atom_structure['modify_time_unix'] = Helper::DateMac2Unix($atom_structure['modify_time']);
                $atom_structure['playtime_seconds'] = $atom_structure['duration'] / $atom_structure['time_scale'];
                $atom_structure['language'] = $this->QuicktimeLanguageLookup($atom_structure['language_id']);
                if (empty($info['comments']['language']) || (!in_array($atom_structure['language'], $info['comments']['language']))) {
                    $info['comments']['language'][] = $atom_structure['language'];
                }
                break;

            case 'pnot': // Preview atom
                $atom_structure['modification_date'] = Helper::BigEndian2Int(substr($atom_data, 0, 4)); // "standard Macintosh format"
                $atom_structure['version_number'] = Helper::BigEndian2Int(substr($atom_data, 4, 2)); // hardcoded: 0x00
                $atom_structure['atom_type'] = substr($atom_data, 6, 4);        // usually: 'PICT'
                $atom_structure['atom_index'] = Helper::BigEndian2Int(substr($atom_data, 10, 2)); // usually: 0x01

                $atom_structure['modification_date_unix'] = Helper::DateMac2Unix($atom_structure['modification_date']);
                break;

            case 'crgn': // Clipping ReGioN atom
                $atom_structure['region_size'] = Helper::BigEndian2Int(substr($atom_data, 0, 2)); // The Region size, Region boundary box,
                $atom_structure['boundary_box'] = Helper::BigEndian2Int(substr($atom_data, 2, 8)); // and Clipping region data fields
                $atom_structure['clipping_data'] = substr($atom_data, 10);           // constitute a QuickDraw region.
                break;

            case 'load': // track LOAD settings atom
                $atom_structure['preload_start_time'] = Helper::BigEndian2Int(substr($atom_data, 0, 4));
                $atom_structure['preload_duration'] = Helper::BigEndian2Int(substr($atom_data, 4, 4));
                $atom_structure['preload_flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 8, 4));
                $atom_structure['default_hints_raw'] = Helper::BigEndian2Int(substr($atom_data, 12, 4));

                $atom_structure['default_hints']['double_buffer'] = (bool) ($atom_structure['default_hints_raw'] & 0x0020);
                $atom_structure['default_hints']['high_quality'] = (bool) ($atom_structure['default_hints_raw'] & 0x0100);
                break;

            case 'tmcd': // TiMe CoDe atom
            case 'chap': // CHAPter list atom
            case 'sync': // SYNChronization atom
            case 'scpt': // tranSCriPT atom
            case 'ssrc': // non-primary SouRCe atom
                for ($i = 0; $i < (strlen($atom_data) % 4); ++$i) {
                    $atom_structure['track_id'][$i] = Helper::BigEndian2Int(substr($atom_data, $i * 4, 4));
                }
                break;

            case 'elst': // Edit LiST atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                $atom_structure['number_entries'] = Helper::BigEndian2Int(substr($atom_data, 4, 4));
                for ($i = 0; $i < $atom_structure['number_entries']; ++$i) {
                    $atom_structure['edit_list'][$i]['track_duration'] = Helper::BigEndian2Int(substr($atom_data, 8 + ($i * 12) + 0, 4));
                    $atom_structure['edit_list'][$i]['media_time'] = Helper::BigEndian2Int(substr($atom_data, 8 + ($i * 12) + 4, 4));
                    $atom_structure['edit_list'][$i]['media_rate'] = Helper::FixedPoint16_16(substr($atom_data, 8 + ($i * 12) + 8, 4));
                }
                break;

            case 'kmat': // compressed MATte atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3)); // hardcoded: 0x0000
                $atom_structure['matte_data_raw'] = substr($atom_data, 4);
                break;

            case 'ctab': // Color TABle atom
                $atom_structure['color_table_seed'] = Helper::BigEndian2Int(substr($atom_data, 0, 4)); // hardcoded: 0x00000000
                $atom_structure['color_table_flags'] = Helper::BigEndian2Int(substr($atom_data, 4, 2)); // hardcoded: 0x8000
                $atom_structure['color_table_size'] = Helper::BigEndian2Int(substr($atom_data, 6, 2)) + 1;
                for ($colortableentry = 0; $colortableentry < $atom_structure['color_table_size']; ++$colortableentry) {
                    $atom_structure['color_table'][$colortableentry]['alpha'] = Helper::BigEndian2Int(substr($atom_data, 8 + ($colortableentry * 8) + 0, 2));
                    $atom_structure['color_table'][$colortableentry]['red'] = Helper::BigEndian2Int(substr($atom_data, 8 + ($colortableentry * 8) + 2, 2));
                    $atom_structure['color_table'][$colortableentry]['green'] = Helper::BigEndian2Int(substr($atom_data, 8 + ($colortableentry * 8) + 4, 2));
                    $atom_structure['color_table'][$colortableentry]['blue'] = Helper::BigEndian2Int(substr($atom_data, 8 + ($colortableentry * 8) + 6, 2));
                }
                break;

            case 'mvhd': // MoVie HeaDer atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3));
                $atom_structure['creation_time'] = Helper::BigEndian2Int(substr($atom_data, 4, 4));
                $atom_structure['modify_time'] = Helper::BigEndian2Int(substr($atom_data, 8, 4));
                $atom_structure['time_scale'] = Helper::BigEndian2Int(substr($atom_data, 12, 4));
                $atom_structure['duration'] = Helper::BigEndian2Int(substr($atom_data, 16, 4));
                $atom_structure['preferred_rate'] = Helper::FixedPoint16_16(substr($atom_data, 20, 4));
                $atom_structure['preferred_volume'] = Helper::FixedPoint8_8(substr($atom_data, 24, 2));
                $atom_structure['reserved'] = substr($atom_data, 26, 10);
                $atom_structure['matrix_a'] = Helper::FixedPoint16_16(substr($atom_data, 36, 4));
                $atom_structure['matrix_b'] = Helper::FixedPoint16_16(substr($atom_data, 40, 4));
                $atom_structure['matrix_u'] = Helper::FixedPoint2_30(substr($atom_data, 44, 4));
                $atom_structure['matrix_c'] = Helper::FixedPoint16_16(substr($atom_data, 48, 4));
                $atom_structure['matrix_d'] = Helper::FixedPoint16_16(substr($atom_data, 52, 4));
                $atom_structure['matrix_v'] = Helper::FixedPoint2_30(substr($atom_data, 56, 4));
                $atom_structure['matrix_x'] = Helper::FixedPoint16_16(substr($atom_data, 60, 4));
                $atom_structure['matrix_y'] = Helper::FixedPoint16_16(substr($atom_data, 64, 4));
                $atom_structure['matrix_w'] = Helper::FixedPoint2_30(substr($atom_data, 68, 4));
                $atom_structure['preview_time'] = Helper::BigEndian2Int(substr($atom_data, 72, 4));
                $atom_structure['preview_duration'] = Helper::BigEndian2Int(substr($atom_data, 76, 4));
                $atom_structure['poster_time'] = Helper::BigEndian2Int(substr($atom_data, 80, 4));
                $atom_structure['selection_time'] = Helper::BigEndian2Int(substr($atom_data, 84, 4));
                $atom_structure['selection_duration'] = Helper::BigEndian2Int(substr($atom_data, 88, 4));
                $atom_structure['current_time'] = Helper::BigEndian2Int(substr($atom_data, 92, 4));
                $atom_structure['next_track_id'] = Helper::BigEndian2Int(substr($atom_data, 96, 4));

                if ($atom_structure['time_scale'] == 0) {
                    $info['error'][] = 'Corrupt Quicktime file: mvhd.time_scale == zero';

                    return false;
                }
                $atom_structure['creation_time_unix'] = Helper::DateMac2Unix($atom_structure['creation_time']);
                $atom_structure['modify_time_unix'] = Helper::DateMac2Unix($atom_structure['modify_time']);
                $info['quicktime']['time_scale'] = (isset($info['quicktime']['time_scale']) ? max($info['quicktime']['time_scale'], $atom_structure['time_scale']) : $atom_structure['time_scale']);
                $info['quicktime']['display_scale'] = $atom_structure['matrix_a'];
                $info['playtime_seconds'] = $atom_structure['duration'] / $atom_structure['time_scale'];
                break;

            case 'tkhd': // TracK HeaDer atom
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3));
                $atom_structure['creation_time'] = Helper::BigEndian2Int(substr($atom_data, 4, 4));
                $atom_structure['modify_time'] = Helper::BigEndian2Int(substr($atom_data, 8, 4));
                $atom_structure['trackid'] = Helper::BigEndian2Int(substr($atom_data, 12, 4));
                $atom_structure['reserved1'] = Helper::BigEndian2Int(substr($atom_data, 16, 4));
                $atom_structure['duration'] = Helper::BigEndian2Int(substr($atom_data, 20, 4));
                $atom_structure['reserved2'] = Helper::BigEndian2Int(substr($atom_data, 24, 8));
                $atom_structure['layer'] = Helper::BigEndian2Int(substr($atom_data, 32, 2));
                $atom_structure['alternate_group'] = Helper::BigEndian2Int(substr($atom_data, 34, 2));
                $atom_structure['volume'] = Helper::FixedPoint8_8(substr($atom_data, 36, 2));
                $atom_structure['reserved3'] = Helper::BigEndian2Int(substr($atom_data, 38, 2));
                $atom_structure['matrix_a'] = Helper::FixedPoint16_16(substr($atom_data, 40, 4));
                $atom_structure['matrix_b'] = Helper::FixedPoint16_16(substr($atom_data, 44, 4));
                $atom_structure['matrix_u'] = Helper::FixedPoint16_16(substr($atom_data, 48, 4));
                $atom_structure['matrix_c'] = Helper::FixedPoint16_16(substr($atom_data, 52, 4));
                $atom_structure['matrix_d'] = Helper::FixedPoint16_16(substr($atom_data, 56, 4));
                $atom_structure['matrix_v'] = Helper::FixedPoint16_16(substr($atom_data, 60, 4));
                $atom_structure['matrix_x'] = Helper::FixedPoint2_30(substr($atom_data, 64, 4));
                $atom_structure['matrix_y'] = Helper::FixedPoint2_30(substr($atom_data, 68, 4));
                $atom_structure['matrix_w'] = Helper::FixedPoint2_30(substr($atom_data, 72, 4));
                $atom_structure['width'] = Helper::FixedPoint16_16(substr($atom_data, 76, 4));
                $atom_structure['height'] = Helper::FixedPoint16_16(substr($atom_data, 80, 4));

                $atom_structure['flags']['enabled'] = (bool) ($atom_structure['flags_raw'] & 0x0001);
                $atom_structure['flags']['in_movie'] = (bool) ($atom_structure['flags_raw'] & 0x0002);
                $atom_structure['flags']['in_preview'] = (bool) ($atom_structure['flags_raw'] & 0x0004);
                $atom_structure['flags']['in_poster'] = (bool) ($atom_structure['flags_raw'] & 0x0008);
                $atom_structure['creation_time_unix'] = Helper::DateMac2Unix($atom_structure['creation_time']);
                $atom_structure['modify_time_unix'] = Helper::DateMac2Unix($atom_structure['modify_time']);

                if ($atom_structure['flags']['enabled'] == 1) {
                    if (!isset($info['video']['resolution_x']) || !isset($info['video']['resolution_y'])) {
                        $info['video']['resolution_x'] = $atom_structure['width'];
                        $info['video']['resolution_y'] = $atom_structure['height'];
                    }
                    $info['video']['resolution_x'] = max($info['video']['resolution_x'], $atom_structure['width']);
                    $info['video']['resolution_y'] = max($info['video']['resolution_y'], $atom_structure['height']);
                    $info['quicktime']['video']['resolution_x'] = $info['video']['resolution_x'];
                    $info['quicktime']['video']['resolution_y'] = $info['video']['resolution_y'];
                } else {
                    if (isset($info['video']['resolution_x'])) {
                        unset($info['video']['resolution_x']);
                    }
                    if (isset($info['video']['resolution_y'])) {
                        unset($info['video']['resolution_y']);
                    }
                    if (isset($info['quicktime']['video'])) {
                        unset($info['quicktime']['video']);
                    }
                }
                break;

            case 'iods': // Initial Object DeScriptor atom
                // http://www.koders.com/c/fid1FAB3E762903DC482D8A246D4A4BF9F28E049594.aspx?s=windows.h
                // http://libquicktime.sourcearchive.com/documentation/1.0.2plus-pdebian/iods_8c-source.html
                $offset = 0;
                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, $offset, 1));
                $offset += 1;
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, $offset, 3));
                $offset += 3;
                $atom_structure['mp4_iod_tag'] = Helper::BigEndian2Int(substr($atom_data, $offset, 1));
                $offset += 1;
                $atom_structure['length'] = $this->quicktime_read_mp4_descr_length($atom_data, $offset);
                //$offset already adjusted by quicktime_read_mp4_descr_length()
                $atom_structure['object_descriptor_id'] = Helper::BigEndian2Int(substr($atom_data, $offset, 2));
                $offset += 2;
                $atom_structure['od_profile_level'] = Helper::BigEndian2Int(substr($atom_data, $offset, 1));
                $offset += 1;
                $atom_structure['scene_profile_level'] = Helper::BigEndian2Int(substr($atom_data, $offset, 1));
                $offset += 1;
                $atom_structure['audio_profile_id'] = Helper::BigEndian2Int(substr($atom_data, $offset, 1));
                $offset += 1;
                $atom_structure['video_profile_id'] = Helper::BigEndian2Int(substr($atom_data, $offset, 1));
                $offset += 1;
                $atom_structure['graphics_profile_level'] = Helper::BigEndian2Int(substr($atom_data, $offset, 1));
                $offset += 1;

                $atom_structure['num_iods_tracks'] = ($atom_structure['length'] - 7) / 6; // 6 bytes would only be right if all tracks use 1-byte length fields
                for ($i = 0; $i < $atom_structure['num_iods_tracks']; ++$i) {
                    $atom_structure['track'][$i]['ES_ID_IncTag'] = Helper::BigEndian2Int(substr($atom_data, $offset, 1));
                    $offset += 1;
                    $atom_structure['track'][$i]['length'] = $this->quicktime_read_mp4_descr_length($atom_data, $offset);
                    //$offset already adjusted by quicktime_read_mp4_descr_length()
                    $atom_structure['track'][$i]['track_id'] = Helper::BigEndian2Int(substr($atom_data, $offset, 4));
                    $offset += 4;
                }

                $atom_structure['audio_profile_name'] = $this->QuicktimeIODSaudioProfileName($atom_structure['audio_profile_id']);
                $atom_structure['video_profile_name'] = $this->QuicktimeIODSvideoProfileName($atom_structure['video_profile_id']);
                break;

            case 'ftyp': // FileTYPe (?) atom (for MP4 it seems)
                $atom_structure['signature'] = substr($atom_data, 0, 4);
                $atom_structure['unknown_1'] = Helper::BigEndian2Int(substr($atom_data, 4, 4));
                $atom_structure['fourcc'] = substr($atom_data, 8, 4);
                break;

            case 'mdat': // Media DATa atom
            case 'free': // FREE space atom
            case 'skip': // SKIP atom
            case 'wide': // 64-bit expansion placeholder atom
                // 'mdat' data is too big to deal with, contains no useful metadata
                // 'free', 'skip' and 'wide' are just padding, contains no useful data at all

                // When writing QuickTime files, it is sometimes necessary to update an atom's size.
                // It is impossible to update a 32-bit atom to a 64-bit atom since the 32-bit atom
                // is only 8 bytes in size, and the 64-bit atom requires 16 bytes. Therefore, QuickTime
                // puts an 8-byte placeholder atom before any atoms it may have to update the size of.
                // In this way, if the atom needs to be converted from a 32-bit to a 64-bit atom, the
                // placeholder atom can be overwritten to obtain the necessary 8 extra bytes.
                // The placeholder atom has a type of kWideAtomPlaceholderType ( 'wide' ).
                break;

            case 'nsav': // NoSAVe atom
                // http://developer.apple.com/technotes/tn/tn2038.html
                $atom_structure['data'] = Helper::BigEndian2Int(substr($atom_data, 0, 4));
                break;

            case 'ctyp': // Controller TYPe atom (seen on QTVR)
                // http://homepages.slingshot.co.nz/~helmboy/quicktime/formats/qtm-layout.txt
                // some controller names are:
                //   0x00 + 'std' for linear movie
                //   'none' for no controls
                $atom_structure['ctyp'] = substr($atom_data, 0, 4);
                $info['quicktime']['controller'] = $atom_structure['ctyp'];
                switch ($atom_structure['ctyp']) {
                    case 'qtvr':
                        $info['video']['dataformat'] = 'quicktimevr';
                        break;
                }
                break;

            case 'pano': // PANOrama track (seen on QTVR)
                $atom_structure['pano'] = Helper::BigEndian2Int(substr($atom_data, 0, 4));
                break;

            case 'hint': // HINT track
            case 'hinf': //
            case 'hinv': //
            case 'hnti': //
                $info['quicktime']['hinting'] = true;
                break;

            case 'imgt': // IMaGe Track reference (kQTVRImageTrackRefType) (seen on QTVR)
                for ($i = 0; $i < ($atom_structure['size'] - 8); $i += 4) {
                    $atom_structure['imgt'][] = Helper::BigEndian2Int(substr($atom_data, $i, 4));
                }
                break;

            // Observed-but-not-handled atom types are just listed here to prevent warnings being generated
            case 'FXTC': // Something to do with Adobe After Effects (?)
            case 'PrmA':
            case 'code':
            case 'FIEL': // this is NOT "fiel" (Field Ordering) as describe here: http://developer.apple.com/documentation/QuickTime/QTFF/QTFFChap3/chapter_4_section_2.html
            case 'tapt': // TrackApertureModeDimensionsAID - http://developer.apple.com/documentation/QuickTime/Reference/QT7-1_Update_Reference/Constants/Constants.html
                        // tapt seems to be used to compute the video size [http://www.getid3.org/phpBB3/viewtopic.php?t=838]
                        // * http://lists.apple.com/archives/quicktime-api/2006/Aug/msg00014.html
                        // * http://handbrake.fr/irclogs/handbrake-dev/handbrake-dev20080128_pg2.html
            case 'ctts'://  STCompositionOffsetAID             - http://developer.apple.com/documentation/QuickTime/Reference/QTRef_Constants/Reference/reference.html
            case 'cslg'://  STCompositionShiftLeastGreatestAID - http://developer.apple.com/documentation/QuickTime/Reference/QTRef_Constants/Reference/reference.html
            case 'sdtp'://  STSampleDependencyAID              - http://developer.apple.com/documentation/QuickTime/Reference/QTRef_Constants/Reference/reference.html
            case 'stps'://  STPartialSyncSampleAID             - http://developer.apple.com/documentation/QuickTime/Reference/QTRef_Constants/Reference/reference.html
                //$atom_structure['data'] = $atom_data;
                break;

            case '©xyz':  // GPS latitude+longitude+altitude
                $atom_structure['data'] = $atom_data;
                if (preg_match('#([\\+\\-][0-9\\.]+)([\\+\\-][0-9\\.]+)([\\+\\-][0-9\\.]+)?/$#i', $atom_data, $matches)) {
                    @list($all, $latitude, $longitude, $altitude) = $matches;
                    $info['quicktime']['comments']['gps_latitude'][] = floatval($latitude);
                    $info['quicktime']['comments']['gps_longitude'][] = floatval($longitude);
                    if (!empty($altitude)) {
                        $info['quicktime']['comments']['gps_altitude'][] = floatval($altitude);
                    }
                } else {
                    $info['warning'][] = 'QuickTime atom "©xyz" data does not match expected data pattern at offset '.$baseoffset.'. Please report as GetId3Core() bug.';
                }
                break;

            case 'NCDT':
                // http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/Nikon.html
                // Nikon-specific QuickTime tags found in the NCDT atom of MOV videos from some Nikon cameras such as the Coolpix S8000 and D5100
                $atom_structure['subatoms'] = $this->QuicktimeParseContainerAtom($atom_data, $baseoffset + 4, $atomHierarchy, $ParseAllPossibleAtoms);
                break;
            case 'NCTH': // Nikon Camera THumbnail image
            case 'NCVW': // Nikon Camera preVieW image
                // http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/Nikon.html
                if (preg_match('/^\xFF\xD8\xFF/', $atom_data)) {
                    $atom_structure['data'] = $atom_data;
                    $atom_structure['image_mime'] = 'image/jpeg';
                    $atom_structure['description'] = (($atomname == 'NCTH') ? 'Nikon Camera Thumbnail Image' : (($atomname == 'NCVW') ? 'Nikon Camera Preview Image' : 'Nikon preview image'));
                    $info['quicktime']['comments']['picture'][] = array('image_mime' => $atom_structure['image_mime'], 'data' => $atom_data, 'description' => $atom_structure['description']);
                }
                break;
            case 'NCHD': // MakerNoteVersion
                // http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/Nikon.html
                $atom_structure['data'] = $atom_data;
                break;
            case 'NCTG': // NikonTags
                // http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/Nikon.html#NCTG
                $atom_structure['data'] = $this->QuicktimeParseNikonNCTG($atom_data);
                break;
            case 'NCDB': // NikonTags
                // http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/Nikon.html
                $atom_structure['data'] = $atom_data;
                break;

            case "\x00\x00\x00\x00":
            case 'meta': // METAdata atom
                // some kind of metacontainer, may contain a big data dump such as:
                // mdta keys  mdtacom.apple.quicktime.make (mdtacom.apple.quicktime.creationdate ,mdtacom.apple.quicktime.location.ISO6709 $mdtacom.apple.quicktime.software !mdtacom.apple.quicktime.model ilst   data DEApple 0  (data DE2011-05-11T17:54:04+0200 2  *data DE+52.4936+013.3897+040.247/   data DE4.3.1  data DEiPhone 4
                // http://www.geocities.com/xhelmboyx/quicktime/formats/qti-layout.txt

                $atom_structure['version'] = Helper::BigEndian2Int(substr($atom_data, 0, 1));
                $atom_structure['flags_raw'] = Helper::BigEndian2Int(substr($atom_data, 1, 3));
                $atom_structure['subatoms'] = $this->QuicktimeParseContainerAtom(substr($atom_data, 4), $baseoffset + 8, $atomHierarchy, $ParseAllPossibleAtoms);
                //$atom_structure['subatoms']  = $this->QuicktimeParseContainerAtom($atom_data, $baseoffset + 8, $atomHierarchy, $ParseAllPossibleAtoms);
                break;

            case 'data': // metaDATA atom
                // seems to be 2 bytes language code (ASCII), 2 bytes unknown (set to 0x10B5 in sample I have), remainder is useful data
                $atom_structure['language'] = substr($atom_data, 4 + 0, 2);
                $atom_structure['unknown'] = Helper::BigEndian2Int(substr($atom_data, 4 + 2, 2));
                $atom_structure['data'] = substr($atom_data, 4 + 4);
                break;

            default:
                $info['warning'][] = 'Unknown QuickTime atom type: "'.$atomname.'" ('.trim(Helper::PrintHexBytes($atomname)).') at offset '.$baseoffset;
                $atom_structure['data'] = $atom_data;
                break;
        }
        array_pop($atomHierarchy);

        return $atom_structure;
    }

    /**
     * @param  type    $atom_data
     * @param  type    $baseoffset
     * @param  type    $atomHierarchy
     * @param  type    $ParseAllPossibleAtoms
     *
     * @return bool
     */
    public function QuicktimeParseContainerAtom($atom_data, $baseoffset, &$atomHierarchy, $ParseAllPossibleAtoms)
    {
        //echo 'QuicktimeParseContainerAtom('.substr($atom_data, 4, 4).') @ '.$baseoffset.'<br><br>';
        $atom_structure = false;
        $subatomoffset = 0;
        $subatomcounter = 0;
        if ((strlen($atom_data) == 4) && (Helper::BigEndian2Int($atom_data) == 0x00000000)) {
            return false;
        }
        while ($subatomoffset < strlen($atom_data)) {
            $subatomsize = Helper::BigEndian2Int(substr($atom_data, $subatomoffset + 0, 4));
            $subatomname = substr($atom_data, $subatomoffset + 4, 4);
            $subatomdata = substr($atom_data, $subatomoffset + 8, $subatomsize - 8);
            if ($subatomsize == 0) {
                // Furthermore, for historical reasons the list of atoms is optionally
                // terminated by a 32-bit integer set to 0. If you are writing a program
                // to read user data atoms, you should allow for the terminating 0.
                return $atom_structure;
            }

            $atom_structure[$subatomcounter] = $this->QuicktimeParseAtom($subatomname, $subatomsize, $subatomdata, $baseoffset + $subatomoffset, $atomHierarchy, $ParseAllPossibleAtoms);

            $subatomoffset += $subatomsize;
            ++$subatomcounter;
        }

        return $atom_structure;
    }

    /**
     * @param  type $data
     * @param  type $offset
     *
     * @return type
     *
     * @link http://libquicktime.sourcearchive.com/documentation/2:1.0.2plus-pdebian-2build1/esds_8c-source.html
     */
    public function quicktime_read_mp4_descr_length($data, &$offset)
    {
        $num_bytes = 0;
        $length = 0;
        do {
            $b = ord(substr($data, $offset++, 1));
            $length = ($length << 7) | ($b & 0x7F);
        } while (($b & 0x80) && ($num_bytes++ < 4));

        return $length;
    }

    /**
     * @staticvar array $QuicktimeLanguageLookup
     *
     * @param  type $languageid
     *
     * @return type
     */
    public function QuicktimeLanguageLookup($languageid)
    {
        static $QuicktimeLanguageLookup = array();
        if (empty($QuicktimeLanguageLookup)) {
            $QuicktimeLanguageLookup[0] = 'English';
            $QuicktimeLanguageLookup[1] = 'French';
            $QuicktimeLanguageLookup[2] = 'German';
            $QuicktimeLanguageLookup[3] = 'Italian';
            $QuicktimeLanguageLookup[4] = 'Dutch';
            $QuicktimeLanguageLookup[5] = 'Swedish';
            $QuicktimeLanguageLookup[6] = 'Spanish';
            $QuicktimeLanguageLookup[7] = 'Danish';
            $QuicktimeLanguageLookup[8] = 'Portuguese';
            $QuicktimeLanguageLookup[9] = 'Norwegian';
            $QuicktimeLanguageLookup[10] = 'Hebrew';
            $QuicktimeLanguageLookup[11] = 'Japanese';
            $QuicktimeLanguageLookup[12] = 'Arabic';
            $QuicktimeLanguageLookup[13] = 'Finnish';
            $QuicktimeLanguageLookup[14] = 'Greek';
            $QuicktimeLanguageLookup[15] = 'Icelandic';
            $QuicktimeLanguageLookup[16] = 'Maltese';
            $QuicktimeLanguageLookup[17] = 'Turkish';
            $QuicktimeLanguageLookup[18] = 'Croatian';
            $QuicktimeLanguageLookup[19] = 'Chinese (Traditional)';
            $QuicktimeLanguageLookup[20] = 'Urdu';
            $QuicktimeLanguageLookup[21] = 'Hindi';
            $QuicktimeLanguageLookup[22] = 'Thai';
            $QuicktimeLanguageLookup[23] = 'Korean';
            $QuicktimeLanguageLookup[24] = 'Lithuanian';
            $QuicktimeLanguageLookup[25] = 'Polish';
            $QuicktimeLanguageLookup[26] = 'Hungarian';
            $QuicktimeLanguageLookup[27] = 'Estonian';
            $QuicktimeLanguageLookup[28] = 'Lettish';
            $QuicktimeLanguageLookup[28] = 'Latvian';
            $QuicktimeLanguageLookup[29] = 'Saamisk';
            $QuicktimeLanguageLookup[29] = 'Lappish';
            $QuicktimeLanguageLookup[30] = 'Faeroese';
            $QuicktimeLanguageLookup[31] = 'Farsi';
            $QuicktimeLanguageLookup[31] = 'Persian';
            $QuicktimeLanguageLookup[32] = 'Russian';
            $QuicktimeLanguageLookup[33] = 'Chinese (Simplified)';
            $QuicktimeLanguageLookup[34] = 'Flemish';
            $QuicktimeLanguageLookup[35] = 'Irish';
            $QuicktimeLanguageLookup[36] = 'Albanian';
            $QuicktimeLanguageLookup[37] = 'Romanian';
            $QuicktimeLanguageLookup[38] = 'Czech';
            $QuicktimeLanguageLookup[39] = 'Slovak';
            $QuicktimeLanguageLookup[40] = 'Slovenian';
            $QuicktimeLanguageLookup[41] = 'Yiddish';
            $QuicktimeLanguageLookup[42] = 'Serbian';
            $QuicktimeLanguageLookup[43] = 'Macedonian';
            $QuicktimeLanguageLookup[44] = 'Bulgarian';
            $QuicktimeLanguageLookup[45] = 'Ukrainian';
            $QuicktimeLanguageLookup[46] = 'Byelorussian';
            $QuicktimeLanguageLookup[47] = 'Uzbek';
            $QuicktimeLanguageLookup[48] = 'Kazakh';
            $QuicktimeLanguageLookup[49] = 'Azerbaijani';
            $QuicktimeLanguageLookup[50] = 'AzerbaijanAr';
            $QuicktimeLanguageLookup[51] = 'Armenian';
            $QuicktimeLanguageLookup[52] = 'Georgian';
            $QuicktimeLanguageLookup[53] = 'Moldavian';
            $QuicktimeLanguageLookup[54] = 'Kirghiz';
            $QuicktimeLanguageLookup[55] = 'Tajiki';
            $QuicktimeLanguageLookup[56] = 'Turkmen';
            $QuicktimeLanguageLookup[57] = 'Mongolian';
            $QuicktimeLanguageLookup[58] = 'MongolianCyr';
            $QuicktimeLanguageLookup[59] = 'Pashto';
            $QuicktimeLanguageLookup[60] = 'Kurdish';
            $QuicktimeLanguageLookup[61] = 'Kashmiri';
            $QuicktimeLanguageLookup[62] = 'Sindhi';
            $QuicktimeLanguageLookup[63] = 'Tibetan';
            $QuicktimeLanguageLookup[64] = 'Nepali';
            $QuicktimeLanguageLookup[65] = 'Sanskrit';
            $QuicktimeLanguageLookup[66] = 'Marathi';
            $QuicktimeLanguageLookup[67] = 'Bengali';
            $QuicktimeLanguageLookup[68] = 'Assamese';
            $QuicktimeLanguageLookup[69] = 'Gujarati';
            $QuicktimeLanguageLookup[70] = 'Punjabi';
            $QuicktimeLanguageLookup[71] = 'Oriya';
            $QuicktimeLanguageLookup[72] = 'Malayalam';
            $QuicktimeLanguageLookup[73] = 'Kannada';
            $QuicktimeLanguageLookup[74] = 'Tamil';
            $QuicktimeLanguageLookup[75] = 'Telugu';
            $QuicktimeLanguageLookup[76] = 'Sinhalese';
            $QuicktimeLanguageLookup[77] = 'Burmese';
            $QuicktimeLanguageLookup[78] = 'Khmer';
            $QuicktimeLanguageLookup[79] = 'Lao';
            $QuicktimeLanguageLookup[80] = 'Vietnamese';
            $QuicktimeLanguageLookup[81] = 'Indonesian';
            $QuicktimeLanguageLookup[82] = 'Tagalog';
            $QuicktimeLanguageLookup[83] = 'MalayRoman';
            $QuicktimeLanguageLookup[84] = 'MalayArabic';
            $QuicktimeLanguageLookup[85] = 'Amharic';
            $QuicktimeLanguageLookup[86] = 'Tigrinya';
            $QuicktimeLanguageLookup[87] = 'Galla';
            $QuicktimeLanguageLookup[87] = 'Oromo';
            $QuicktimeLanguageLookup[88] = 'Somali';
            $QuicktimeLanguageLookup[89] = 'Swahili';
            $QuicktimeLanguageLookup[90] = 'Ruanda';
            $QuicktimeLanguageLookup[91] = 'Rundi';
            $QuicktimeLanguageLookup[92] = 'Chewa';
            $QuicktimeLanguageLookup[93] = 'Malagasy';
            $QuicktimeLanguageLookup[94] = 'Esperanto';
            $QuicktimeLanguageLookup[128] = 'Welsh';
            $QuicktimeLanguageLookup[129] = 'Basque';
            $QuicktimeLanguageLookup[130] = 'Catalan';
            $QuicktimeLanguageLookup[131] = 'Latin';
            $QuicktimeLanguageLookup[132] = 'Quechua';
            $QuicktimeLanguageLookup[133] = 'Guarani';
            $QuicktimeLanguageLookup[134] = 'Aymara';
            $QuicktimeLanguageLookup[135] = 'Tatar';
            $QuicktimeLanguageLookup[136] = 'Uighur';
            $QuicktimeLanguageLookup[137] = 'Dzongkha';
            $QuicktimeLanguageLookup[138] = 'JavaneseRom';
        }

        return (isset($QuicktimeLanguageLookup[$languageid]) ? $QuicktimeLanguageLookup[$languageid] : 'invalid');
    }

    /**
     * @staticvar array $QuicktimeVideoCodecLookup
     *
     * @param  type $codecid
     *
     * @return type
     */
    public function QuicktimeVideoCodecLookup($codecid)
    {
        static $QuicktimeVideoCodecLookup = array();
        if (empty($QuicktimeVideoCodecLookup)) {
            $QuicktimeVideoCodecLookup['.SGI'] = 'SGI';
            $QuicktimeVideoCodecLookup['3IV1'] = '3ivx MPEG-4 v1';
            $QuicktimeVideoCodecLookup['3IV2'] = '3ivx MPEG-4 v2';
            $QuicktimeVideoCodecLookup['3IVX'] = '3ivx MPEG-4';
            $QuicktimeVideoCodecLookup['8BPS'] = 'Planar RGB';
            $QuicktimeVideoCodecLookup['avc1'] = 'H.264/MPEG-4 AVC';
            $QuicktimeVideoCodecLookup['avr '] = 'AVR-JPEG';
            $QuicktimeVideoCodecLookup['b16g'] = '16Gray';
            $QuicktimeVideoCodecLookup['b32a'] = '32AlphaGray';
            $QuicktimeVideoCodecLookup['b48r'] = '48RGB';
            $QuicktimeVideoCodecLookup['b64a'] = '64ARGB';
            $QuicktimeVideoCodecLookup['base'] = 'Base';
            $QuicktimeVideoCodecLookup['clou'] = 'Cloud';
            $QuicktimeVideoCodecLookup['cmyk'] = 'CMYK';
            $QuicktimeVideoCodecLookup['cvid'] = 'Cinepak';
            $QuicktimeVideoCodecLookup['dmb1'] = 'OpenDML JPEG';
            $QuicktimeVideoCodecLookup['dvc '] = 'DVC-NTSC';
            $QuicktimeVideoCodecLookup['dvcp'] = 'DVC-PAL';
            $QuicktimeVideoCodecLookup['dvpn'] = 'DVCPro-NTSC';
            $QuicktimeVideoCodecLookup['dvpp'] = 'DVCPro-PAL';
            $QuicktimeVideoCodecLookup['fire'] = 'Fire';
            $QuicktimeVideoCodecLookup['flic'] = 'FLC';
            $QuicktimeVideoCodecLookup['gif '] = 'GIF';
            $QuicktimeVideoCodecLookup['h261'] = 'H261';
            $QuicktimeVideoCodecLookup['h263'] = 'H263';
            $QuicktimeVideoCodecLookup['IV41'] = 'Indeo4';
            $QuicktimeVideoCodecLookup['jpeg'] = 'JPEG';
            $QuicktimeVideoCodecLookup['kpcd'] = 'PhotoCD';
            $QuicktimeVideoCodecLookup['mjpa'] = 'Motion JPEG-A';
            $QuicktimeVideoCodecLookup['mjpb'] = 'Motion JPEG-B';
            $QuicktimeVideoCodecLookup['msvc'] = 'Microsoft Video1';
            $QuicktimeVideoCodecLookup['myuv'] = 'MPEG YUV420';
            $QuicktimeVideoCodecLookup['path'] = 'Vector';
            $QuicktimeVideoCodecLookup['png '] = 'PNG';
            $QuicktimeVideoCodecLookup['PNTG'] = 'MacPaint';
            $QuicktimeVideoCodecLookup['qdgx'] = 'QuickDrawGX';
            $QuicktimeVideoCodecLookup['qdrw'] = 'QuickDraw';
            $QuicktimeVideoCodecLookup['raw '] = 'RAW';
            $QuicktimeVideoCodecLookup['ripl'] = 'WaterRipple';
            $QuicktimeVideoCodecLookup['rpza'] = 'Video';
            $QuicktimeVideoCodecLookup['smc '] = 'Graphics';
            $QuicktimeVideoCodecLookup['SVQ1'] = 'Sorenson Video 1';
            $QuicktimeVideoCodecLookup['SVQ1'] = 'Sorenson Video 3';
            $QuicktimeVideoCodecLookup['syv9'] = 'Sorenson YUV9';
            $QuicktimeVideoCodecLookup['tga '] = 'Targa';
            $QuicktimeVideoCodecLookup['tiff'] = 'TIFF';
            $QuicktimeVideoCodecLookup['WRAW'] = 'Windows RAW';
            $QuicktimeVideoCodecLookup['WRLE'] = 'BMP';
            $QuicktimeVideoCodecLookup['y420'] = 'YUV420';
            $QuicktimeVideoCodecLookup['yuv2'] = 'ComponentVideo';
            $QuicktimeVideoCodecLookup['yuvs'] = 'ComponentVideoUnsigned';
            $QuicktimeVideoCodecLookup['yuvu'] = 'ComponentVideoSigned';
        }

        return (isset($QuicktimeVideoCodecLookup[$codecid]) ? $QuicktimeVideoCodecLookup[$codecid] : '');
    }

    /**
     * @staticvar array $QuicktimeAudioCodecLookup
     *
     * @param  type $codecid
     *
     * @return type
     */
    public function QuicktimeAudioCodecLookup($codecid)
    {
        static $QuicktimeAudioCodecLookup = array();
        if (empty($QuicktimeAudioCodecLookup)) {
            $QuicktimeAudioCodecLookup['.mp3'] = 'Fraunhofer MPEG Layer-III alias';
            $QuicktimeAudioCodecLookup['aac '] = 'ISO/IEC 14496-3 AAC';
            $QuicktimeAudioCodecLookup['agsm'] = 'Apple GSM 10:1';
            $QuicktimeAudioCodecLookup['alac'] = 'Apple Lossless Audio Codec';
            $QuicktimeAudioCodecLookup['alaw'] = 'A-law 2:1';
            $QuicktimeAudioCodecLookup['conv'] = 'Sample Format';
            $QuicktimeAudioCodecLookup['dvca'] = 'DV';
            $QuicktimeAudioCodecLookup['dvi '] = 'DV 4:1';
            $QuicktimeAudioCodecLookup['eqal'] = 'Frequency Equalizer';
            $QuicktimeAudioCodecLookup['fl32'] = '32-bit Floating Point';
            $QuicktimeAudioCodecLookup['fl64'] = '64-bit Floating Point';
            $QuicktimeAudioCodecLookup['ima4'] = 'Interactive Multimedia Association 4:1';
            $QuicktimeAudioCodecLookup['in24'] = '24-bit Integer';
            $QuicktimeAudioCodecLookup['in32'] = '32-bit Integer';
            $QuicktimeAudioCodecLookup['lpc '] = 'LPC 23:1';
            $QuicktimeAudioCodecLookup['MAC3'] = 'Macintosh Audio Compression/Expansion (MACE) 3:1';
            $QuicktimeAudioCodecLookup['MAC6'] = 'Macintosh Audio Compression/Expansion (MACE) 6:1';
            $QuicktimeAudioCodecLookup['mixb'] = '8-bit Mixer';
            $QuicktimeAudioCodecLookup['mixw'] = '16-bit Mixer';
            $QuicktimeAudioCodecLookup['mp4a'] = 'ISO/IEC 14496-3 AAC';
            $QuicktimeAudioCodecLookup['MS'."\x00\x02"] = 'Microsoft ADPCM';
            $QuicktimeAudioCodecLookup['MS'."\x00\x11"] = 'DV IMA';
            $QuicktimeAudioCodecLookup['MS'."\x00\x55"] = 'Fraunhofer MPEG Layer III';
            $QuicktimeAudioCodecLookup['NONE'] = 'No Encoding';
            $QuicktimeAudioCodecLookup['Qclp'] = 'Qualcomm PureVoice';
            $QuicktimeAudioCodecLookup['QDM2'] = 'QDesign Music 2';
            $QuicktimeAudioCodecLookup['QDMC'] = 'QDesign Music 1';
            $QuicktimeAudioCodecLookup['ratb'] = '8-bit Rate';
            $QuicktimeAudioCodecLookup['ratw'] = '16-bit Rate';
            $QuicktimeAudioCodecLookup['raw '] = 'raw PCM';
            $QuicktimeAudioCodecLookup['sour'] = 'Sound Source';
            $QuicktimeAudioCodecLookup['sowt'] = 'signed/two\'s complement (Little Endian)';
            $QuicktimeAudioCodecLookup['str1'] = 'Iomega MPEG layer II';
            $QuicktimeAudioCodecLookup['str2'] = 'Iomega MPEG *layer II';
            $QuicktimeAudioCodecLookup['str3'] = 'Iomega MPEG **layer II';
            $QuicktimeAudioCodecLookup['str4'] = 'Iomega MPEG ***layer II';
            $QuicktimeAudioCodecLookup['twos'] = 'signed/two\'s complement (Big Endian)';
            $QuicktimeAudioCodecLookup['ulaw'] = 'mu-law 2:1';
        }

        return (isset($QuicktimeAudioCodecLookup[$codecid]) ? $QuicktimeAudioCodecLookup[$codecid] : '');
    }

    /**
     * @staticvar array $QuicktimeDCOMLookup
     *
     * @param  type $compressionid
     *
     * @return type
     */
    public function QuicktimeDCOMLookup($compressionid)
    {
        static $QuicktimeDCOMLookup = array();
        if (empty($QuicktimeDCOMLookup)) {
            $QuicktimeDCOMLookup['zlib'] = 'ZLib Deflate';
            $QuicktimeDCOMLookup['adec'] = 'Apple Compression';
        }

        return (isset($QuicktimeDCOMLookup[$compressionid]) ? $QuicktimeDCOMLookup[$compressionid] : '');
    }

    /**
     * @staticvar array $QuicktimeColorNameLookup
     *
     * @param  type $colordepthid
     *
     * @return type
     */
    public function QuicktimeColorNameLookup($colordepthid)
    {
        static $QuicktimeColorNameLookup = array();
        if (empty($QuicktimeColorNameLookup)) {
            $QuicktimeColorNameLookup[1] = '2-color (monochrome)';
            $QuicktimeColorNameLookup[2] = '4-color';
            $QuicktimeColorNameLookup[4] = '16-color';
            $QuicktimeColorNameLookup[8] = '256-color';
            $QuicktimeColorNameLookup[16] = 'thousands (16-bit color)';
            $QuicktimeColorNameLookup[24] = 'millions (24-bit color)';
            $QuicktimeColorNameLookup[32] = 'millions+ (32-bit color)';
            $QuicktimeColorNameLookup[33] = 'black & white';
            $QuicktimeColorNameLookup[34] = '4-gray';
            $QuicktimeColorNameLookup[36] = '16-gray';
            $QuicktimeColorNameLookup[40] = '256-gray';
        }

        return (isset($QuicktimeColorNameLookup[$colordepthid]) ? $QuicktimeColorNameLookup[$colordepthid] : 'invalid');
    }

    /**
     * @staticvar array $QuicktimeSTIKLookup
     *
     * @param  type $stik
     *
     * @return type
     */
    public function QuicktimeSTIKLookup($stik)
    {
        static $QuicktimeSTIKLookup = array();
        if (empty($QuicktimeSTIKLookup)) {
            $QuicktimeSTIKLookup[0] = 'Movie';
            $QuicktimeSTIKLookup[1] = 'Normal';
            $QuicktimeSTIKLookup[2] = 'Audiobook';
            $QuicktimeSTIKLookup[5] = 'Whacked Bookmark';
            $QuicktimeSTIKLookup[6] = 'Music Video';
            $QuicktimeSTIKLookup[9] = 'Short Film';
            $QuicktimeSTIKLookup[10] = 'TV Show';
            $QuicktimeSTIKLookup[11] = 'Booklet';
            $QuicktimeSTIKLookup[14] = 'Ringtone';
            $QuicktimeSTIKLookup[21] = 'Podcast';
        }

        return (isset($QuicktimeSTIKLookup[$stik]) ? $QuicktimeSTIKLookup[$stik] : 'invalid');
    }

    /**
     * @staticvar array $QuicktimeIODSaudioProfileNameLookup
     *
     * @param  type $audio_profile_id
     *
     * @return type
     */
    public function QuicktimeIODSaudioProfileName($audio_profile_id)
    {
        static $QuicktimeIODSaudioProfileNameLookup = array();
        if (empty($QuicktimeIODSaudioProfileNameLookup)) {
            $QuicktimeIODSaudioProfileNameLookup = array(
                0x00 => 'ISO Reserved (0x00)',
                0x01 => 'Main Audio Profile @ Level 1',
                0x02 => 'Main Audio Profile @ Level 2',
                0x03 => 'Main Audio Profile @ Level 3',
                0x04 => 'Main Audio Profile @ Level 4',
                0x05 => 'Scalable Audio Profile @ Level 1',
                0x06 => 'Scalable Audio Profile @ Level 2',
                0x07 => 'Scalable Audio Profile @ Level 3',
                0x08 => 'Scalable Audio Profile @ Level 4',
                0x09 => 'Speech Audio Profile @ Level 1',
                0x0A => 'Speech Audio Profile @ Level 2',
                0x0B => 'Synthetic Audio Profile @ Level 1',
                0x0C => 'Synthetic Audio Profile @ Level 2',
                0x0D => 'Synthetic Audio Profile @ Level 3',
                0x0E => 'High Quality Audio Profile @ Level 1',
                0x0F => 'High Quality Audio Profile @ Level 2',
                0x10 => 'High Quality Audio Profile @ Level 3',
                0x11 => 'High Quality Audio Profile @ Level 4',
                0x12 => 'High Quality Audio Profile @ Level 5',
                0x13 => 'High Quality Audio Profile @ Level 6',
                0x14 => 'High Quality Audio Profile @ Level 7',
                0x15 => 'High Quality Audio Profile @ Level 8',
                0x16 => 'Low Delay Audio Profile @ Level 1',
                0x17 => 'Low Delay Audio Profile @ Level 2',
                0x18 => 'Low Delay Audio Profile @ Level 3',
                0x19 => 'Low Delay Audio Profile @ Level 4',
                0x1A => 'Low Delay Audio Profile @ Level 5',
                0x1B => 'Low Delay Audio Profile @ Level 6',
                0x1C => 'Low Delay Audio Profile @ Level 7',
                0x1D => 'Low Delay Audio Profile @ Level 8',
                0x1E => 'Natural Audio Profile @ Level 1',
                0x1F => 'Natural Audio Profile @ Level 2',
                0x20 => 'Natural Audio Profile @ Level 3',
                0x21 => 'Natural Audio Profile @ Level 4',
                0x22 => 'Mobile Audio Internetworking Profile @ Level 1',
                0x23 => 'Mobile Audio Internetworking Profile @ Level 2',
                0x24 => 'Mobile Audio Internetworking Profile @ Level 3',
                0x25 => 'Mobile Audio Internetworking Profile @ Level 4',
                0x26 => 'Mobile Audio Internetworking Profile @ Level 5',
                0x27 => 'Mobile Audio Internetworking Profile @ Level 6',
                0x28 => 'AAC Profile @ Level 1',
                0x29 => 'AAC Profile @ Level 2',
                0x2A => 'AAC Profile @ Level 4',
                0x2B => 'AAC Profile @ Level 5',
                0x2C => 'High Efficiency AAC Profile @ Level 2',
                0x2D => 'High Efficiency AAC Profile @ Level 3',
                0x2E => 'High Efficiency AAC Profile @ Level 4',
                0x2F => 'High Efficiency AAC Profile @ Level 5',
                0xFE => 'Not part of MPEG-4 audio profiles',
                0xFF => 'No audio capability required',
            );
        }

        return (isset($QuicktimeIODSaudioProfileNameLookup[$audio_profile_id]) ? $QuicktimeIODSaudioProfileNameLookup[$audio_profile_id] : 'ISO Reserved / User Private');
    }

    /**
     * @staticvar array $QuicktimeIODSvideoProfileNameLookup
     *
     * @param  type $video_profile_id
     *
     * @return type
     */
    public function QuicktimeIODSvideoProfileName($video_profile_id)
    {
        static $QuicktimeIODSvideoProfileNameLookup = array();
        if (empty($QuicktimeIODSvideoProfileNameLookup)) {
            $QuicktimeIODSvideoProfileNameLookup = array(
                0x00 => 'Reserved (0x00) Profile',
                0x01 => 'Simple Profile @ Level 1',
                0x02 => 'Simple Profile @ Level 2',
                0x03 => 'Simple Profile @ Level 3',
                0x08 => 'Simple Profile @ Level 0',
                0x10 => 'Simple Scalable Profile @ Level 0',
                0x11 => 'Simple Scalable Profile @ Level 1',
                0x12 => 'Simple Scalable Profile @ Level 2',
                0x15 => 'AVC/H264 Profile',
                0x21 => 'Core Profile @ Level 1',
                0x22 => 'Core Profile @ Level 2',
                0x32 => 'Main Profile @ Level 2',
                0x33 => 'Main Profile @ Level 3',
                0x34 => 'Main Profile @ Level 4',
                0x42 => 'N-bit Profile @ Level 2',
                0x51 => 'Scalable Texture Profile @ Level 1',
                0x61 => 'Simple Face Animation Profile @ Level 1',
                0x62 => 'Simple Face Animation Profile @ Level 2',
                0x63 => 'Simple FBA Profile @ Level 1',
                0x64 => 'Simple FBA Profile @ Level 2',
                0x71 => 'Basic Animated Texture Profile @ Level 1',
                0x72 => 'Basic Animated Texture Profile @ Level 2',
                0x81 => 'Hybrid Profile @ Level 1',
                0x82 => 'Hybrid Profile @ Level 2',
                0x91 => 'Advanced Real Time Simple Profile @ Level 1',
                0x92 => 'Advanced Real Time Simple Profile @ Level 2',
                0x93 => 'Advanced Real Time Simple Profile @ Level 3',
                0x94 => 'Advanced Real Time Simple Profile @ Level 4',
                0xA1 => 'Core Scalable Profile @ Level1',
                0xA2 => 'Core Scalable Profile @ Level2',
                0xA3 => 'Core Scalable Profile @ Level3',
                0xB1 => 'Advanced Coding Efficiency Profile @ Level 1',
                0xB2 => 'Advanced Coding Efficiency Profile @ Level 2',
                0xB3 => 'Advanced Coding Efficiency Profile @ Level 3',
                0xB4 => 'Advanced Coding Efficiency Profile @ Level 4',
                0xC1 => 'Advanced Core Profile @ Level 1',
                0xC2 => 'Advanced Core Profile @ Level 2',
                0xD1 => 'Advanced Scalable Texture @ Level1',
                0xD2 => 'Advanced Scalable Texture @ Level2',
                0xE1 => 'Simple Studio Profile @ Level 1',
                0xE2 => 'Simple Studio Profile @ Level 2',
                0xE3 => 'Simple Studio Profile @ Level 3',
                0xE4 => 'Simple Studio Profile @ Level 4',
                0xE5 => 'Core Studio Profile @ Level 1',
                0xE6 => 'Core Studio Profile @ Level 2',
                0xE7 => 'Core Studio Profile @ Level 3',
                0xE8 => 'Core Studio Profile @ Level 4',
                0xF0 => 'Advanced Simple Profile @ Level 0',
                0xF1 => 'Advanced Simple Profile @ Level 1',
                0xF2 => 'Advanced Simple Profile @ Level 2',
                0xF3 => 'Advanced Simple Profile @ Level 3',
                0xF4 => 'Advanced Simple Profile @ Level 4',
                0xF5 => 'Advanced Simple Profile @ Level 5',
                0xF7 => 'Advanced Simple Profile @ Level 3b',
                0xF8 => 'Fine Granularity Scalable Profile @ Level 0',
                0xF9 => 'Fine Granularity Scalable Profile @ Level 1',
                0xFA => 'Fine Granularity Scalable Profile @ Level 2',
                0xFB => 'Fine Granularity Scalable Profile @ Level 3',
                0xFC => 'Fine Granularity Scalable Profile @ Level 4',
                0xFD => 'Fine Granularity Scalable Profile @ Level 5',
                0xFE => 'Not part of MPEG-4 Visual profiles',
                0xFF => 'No visual capability required',
            );
        }

        return (isset($QuicktimeIODSvideoProfileNameLookup[$video_profile_id]) ? $QuicktimeIODSvideoProfileNameLookup[$video_profile_id] : 'ISO Reserved Profile');
    }

    /**
     * @staticvar array $QuicktimeContentRatingLookup
     *
     * @param  type $rtng
     *
     * @return type
     */
    public function QuicktimeContentRatingLookup($rtng)
    {
        static $QuicktimeContentRatingLookup = array();
        if (empty($QuicktimeContentRatingLookup)) {
            $QuicktimeContentRatingLookup[0] = 'None';
            $QuicktimeContentRatingLookup[2] = 'Clean';
            $QuicktimeContentRatingLookup[4] = 'Explicit';
        }

        return (isset($QuicktimeContentRatingLookup[$rtng]) ? $QuicktimeContentRatingLookup[$rtng] : 'invalid');
    }

    /**
     * @staticvar array $QuicktimeStoreAccountTypeLookup
     *
     * @param  type $akid
     *
     * @return type
     */
    public function QuicktimeStoreAccountTypeLookup($akid)
    {
        static $QuicktimeStoreAccountTypeLookup = array();
        if (empty($QuicktimeStoreAccountTypeLookup)) {
            $QuicktimeStoreAccountTypeLookup[0] = 'iTunes';
            $QuicktimeStoreAccountTypeLookup[1] = 'AOL';
        }

        return (isset($QuicktimeStoreAccountTypeLookup[$akid]) ? $QuicktimeStoreAccountTypeLookup[$akid] : 'invalid');
    }

    /**
     * @staticvar array $QuicktimeStoreFrontCodeLookup
     *
     * @param  type $sfid
     *
     * @return type
     */
    public function QuicktimeStoreFrontCodeLookup($sfid)
    {
        static $QuicktimeStoreFrontCodeLookup = array();
        if (empty($QuicktimeStoreFrontCodeLookup)) {
            $QuicktimeStoreFrontCodeLookup[143460] = 'Australia';
            $QuicktimeStoreFrontCodeLookup[143445] = 'Austria';
            $QuicktimeStoreFrontCodeLookup[143446] = 'Belgium';
            $QuicktimeStoreFrontCodeLookup[143455] = 'Canada';
            $QuicktimeStoreFrontCodeLookup[143458] = 'Denmark';
            $QuicktimeStoreFrontCodeLookup[143447] = 'Finland';
            $QuicktimeStoreFrontCodeLookup[143442] = 'France';
            $QuicktimeStoreFrontCodeLookup[143443] = 'Germany';
            $QuicktimeStoreFrontCodeLookup[143448] = 'Greece';
            $QuicktimeStoreFrontCodeLookup[143449] = 'Ireland';
            $QuicktimeStoreFrontCodeLookup[143450] = 'Italy';
            $QuicktimeStoreFrontCodeLookup[143462] = 'Japan';
            $QuicktimeStoreFrontCodeLookup[143451] = 'Luxembourg';
            $QuicktimeStoreFrontCodeLookup[143452] = 'Netherlands';
            $QuicktimeStoreFrontCodeLookup[143461] = 'New Zealand';
            $QuicktimeStoreFrontCodeLookup[143457] = 'Norway';
            $QuicktimeStoreFrontCodeLookup[143453] = 'Portugal';
            $QuicktimeStoreFrontCodeLookup[143454] = 'Spain';
            $QuicktimeStoreFrontCodeLookup[143456] = 'Sweden';
            $QuicktimeStoreFrontCodeLookup[143459] = 'Switzerland';
            $QuicktimeStoreFrontCodeLookup[143444] = 'United Kingdom';
            $QuicktimeStoreFrontCodeLookup[143441] = 'United States';
        }

        return (isset($QuicktimeStoreFrontCodeLookup[$sfid]) ? $QuicktimeStoreFrontCodeLookup[$sfid] : 'invalid');
    }

    /**
     * @param  type $atom_data
     *
     * @return type
     *
     * @link http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/Nikon.html#NCTG
     */
    public function QuicktimeParseNikonNCTG($atom_data)
    {
        // Nikon-specific QuickTime tags found in the NCDT atom of MOV videos from some Nikon cameras such as the Coolpix S8000 and D5100
        // Data is stored as records of:
        // * 4 bytes record type
        // * 2 bytes size of data field type:
        //     0x0001 = flag   (size field *= 1-byte)
        //     0x0002 = char   (size field *= 1-byte)
        //     0x0003 = DWORD+ (size field *= 2-byte), values are stored CDAB
        //     0x0004 = QWORD+ (size field *= 4-byte), values are stored EFGHABCD
        //     0x0005 = float  (size field *= 8-byte), values are stored aaaabbbb where value is aaaa/bbbb; possibly multiple sets of values appended together
        //     0x0007 = bytes  (size field *= 1-byte), values are stored as ??????
        //     0x0008 = ?????  (size field *= 2-byte), values are stored as ??????
        // * 2 bytes data size field
        // * ? bytes data (string data may be null-padded; datestamp fields are in the format "2011:05:25 20:24:15")
        // all integers are stored BigEndian

        $NCTGtagName = array(
            0x00000001 => 'Make',
            0x00000002 => 'Model',
            0x00000003 => 'Software',
            0x00000011 => 'CreateDate',
            0x00000012 => 'DateTimeOriginal',
            0x00000013 => 'FrameCount',
            0x00000016 => 'FrameRate',
            0x00000022 => 'FrameWidth',
            0x00000023 => 'FrameHeight',
            0x00000032 => 'AudioChannels',
            0x00000033 => 'AudioBitsPerSample',
            0x00000034 => 'AudioSampleRate',
            0x02000001 => 'MakerNoteVersion',
            0x02000005 => 'WhiteBalance',
            0x0200000b => 'WhiteBalanceFineTune',
            0x0200001e => 'ColorSpace',
            0x02000023 => 'PictureControlData',
            0x02000024 => 'WorldTime',
            0x02000032 => 'UnknownInfo',
            0x02000083 => 'LensType',
            0x02000084 => 'Lens',
        );

        $offset = 0;
        $datalength = strlen($atom_data);
        $parsed = array();
        while ($offset < $datalength) {
            //echo GetId3_lib::PrintHexBytes(substr($atom_data, $offset, 4)).'<br>';
            $record_type = Helper::BigEndian2Int(substr($atom_data, $offset, 4));
            $offset += 4;
            $data_size_type = Helper::BigEndian2Int(substr($atom_data, $offset, 2));
            $offset += 2;
            $data_size = Helper::BigEndian2Int(substr($atom_data, $offset, 2));
            $offset += 2;
            switch ($data_size_type) {
                case 0x0001: // 0x0001 = flag   (size field *= 1-byte)
                    $data = Helper::BigEndian2Int(substr($atom_data, $offset, $data_size * 1));
                    $offset += ($data_size * 1);
                    break;
                case 0x0002: // 0x0002 = char   (size field *= 1-byte)
                    $data = substr($atom_data, $offset, $data_size * 1);
                    $offset += ($data_size * 1);
                    $data = rtrim($data, "\x00");
                    break;
                case 0x0003: // 0x0003 = DWORD+ (size field *= 2-byte), values are stored CDAB
                    $data = '';
                    for ($i = $data_size - 1; $i >= 0; --$i) {
                        $data .= substr($atom_data, $offset + ($i * 2), 2);
                    }
                    $data = Helper::BigEndian2Int($data);
                    $offset += ($data_size * 2);
                    break;
                case 0x0004: // 0x0004 = QWORD+ (size field *= 4-byte), values are stored EFGHABCD
                    $data = '';
                    for ($i = $data_size - 1; $i >= 0; --$i) {
                        $data .= substr($atom_data, $offset + ($i * 4), 4);
                    }
                    $data = Helper::BigEndian2Int($data);
                    $offset += ($data_size * 4);
                    break;
                case 0x0005: // 0x0005 = float  (size field *= 8-byte), values are stored aaaabbbb where value is aaaa/bbbb; possibly multiple sets of values appended together
                    $data = array();
                    for ($i = 0; $i < $data_size; ++$i) {
                        $numerator = Helper::BigEndian2Int(substr($atom_data, $offset + ($i * 8) + 0, 4));
                        $denomninator = Helper::BigEndian2Int(substr($atom_data, $offset + ($i * 8) + 4, 4));
                        if ($denomninator == 0) {
                            $data[$i] = false;
                        } else {
                            $data[$i] = (double) $numerator / $denomninator;
                        }
                    }
                    $offset += (8 * $data_size);
                    if (count($data) == 1) {
                        $data = $data[0];
                    }
                    break;
                case 0x0007: // 0x0007 = bytes  (size field *= 1-byte), values are stored as ??????
                    $data = substr($atom_data, $offset, $data_size * 1);
                    $offset += ($data_size * 1);
                    break;
                case 0x0008: // 0x0008 = ?????  (size field *= 2-byte), values are stored as ??????
                    $data = substr($atom_data, $offset, $data_size * 2);
                    $offset += ($data_size * 2);
                    break;
                default:
echo 'QuicktimeParseNikonNCTG()::unknown $data_size_type: '.$data_size_type.'<br>';
                    break 2;
            }

            switch ($record_type) {
                case 0x00000011: // CreateDate
                case 0x00000012: // DateTimeOriginal
                    $data = strtotime($data);
                    break;
                case 0x0200001e: // ColorSpace
                    switch ($data) {
                        case 1:
                            $data = 'sRGB';
                            break;
                        case 2:
                            $data = 'Adobe RGB';
                            break;
                    }
                    break;
                case 0x02000023: // PictureControlData
                    $PictureControlAdjust = array(0 => 'default', 1 => 'quick', 2 => 'full');
                    $FilterEffect = array(0x80 => 'off', 0x81 => 'yellow', 0x82 => 'orange',    0x83 => 'red', 0x84 => 'green',  0xff => 'n/a');
                    $ToningEffect = array(0x80 => 'b&w', 0x81 => 'sepia',  0x82 => 'cyanotype', 0x83 => 'red', 0x84 => 'yellow', 0x85 => 'green', 0x86 => 'blue-green', 0x87 => 'blue', 0x88 => 'purple-blue', 0x89 => 'red-purple', 0xff => 'n/a');
                    $data = array(
                        'PictureControlVersion' => substr($data, 0, 4),
                        'PictureControlName' => rtrim(substr($data, 4, 20), "\x00"),
                        'PictureControlBase' => rtrim(substr($data, 24, 20), "\x00"),
                        //'?'                       =>                           substr($data, 44,  4),
                        'PictureControlAdjust' => $PictureControlAdjust[ord(substr($data, 48, 1))],
                        'PictureControlQuickAdjust' => ord(substr($data, 49, 1)),
                        'Sharpness' => ord(substr($data, 50, 1)),
                        'Contrast' => ord(substr($data, 51, 1)),
                        'Brightness' => ord(substr($data, 52, 1)),
                        'Saturation' => ord(substr($data, 53, 1)),
                        'HueAdjustment' => ord(substr($data, 54, 1)),
                        'FilterEffect' => $FilterEffect[ord(substr($data, 55, 1))],
                        'ToningEffect' => $ToningEffect[ord(substr($data, 56, 1))],
                        'ToningSaturation' => ord(substr($data, 57, 1)),
                    );
                    break;
                case 0x02000024: // WorldTime
                    // http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/Nikon.html#WorldTime
                    // timezone is stored as offset from GMT in minutes
                    $timezone = Helper::BigEndian2Int(substr($data, 0, 2));
                    if ($timezone & 0x8000) {
                        $timezone = 0 - (0x10000 - $timezone);
                    }
                    $timezone /= 60;

                    $dst = (bool) Helper::BigEndian2Int(substr($data, 2, 1));
                    switch (Helper::BigEndian2Int(substr($data, 3, 1))) {
                        case 2:
                            $datedisplayformat = 'D/M/Y'; break;
                        case 1:
                            $datedisplayformat = 'M/D/Y'; break;
                        case 0:
                        default:
                            $datedisplayformat = 'Y/M/D'; break;
                    }

                    $data = array('timezone' => floatval($timezone), 'dst' => $dst, 'display' => $datedisplayformat);
                    break;
                case 0x02000083: // LensType
                    $data = array(
                        //'_'  => $data,
                        'mf' => (bool) ($data & 0x01),
                        'd' => (bool) ($data & 0x02),
                        'g' => (bool) ($data & 0x04),
                        'vr' => (bool) ($data & 0x08),
                    );
                    break;
            }
            $tag_name = (isset($NCTGtagName[$record_type]) ? $NCTGtagName[$record_type] : '0x'.str_pad(dechex($record_type), 8, '0', STR_PAD_LEFT));
            $parsed[$tag_name] = $data;
        }

        return $parsed;
    }

    /**
     * @staticvar array $handyatomtranslatorarray
     *
     * @param  type    $keyname
     * @param  type    $data
     * @param  type    $boxname
     *
     * @return bool
     */
    public function CopyToAppropriateCommentsSection($keyname, $data, $boxname = '')
    {
        static $handyatomtranslatorarray = array();
        if (empty($handyatomtranslatorarray)) {
            $handyatomtranslatorarray['©cpy'] = 'copyright';
            $handyatomtranslatorarray['©day'] = 'creation_date';    // iTunes 4.0
            $handyatomtranslatorarray['©dir'] = 'director';
            $handyatomtranslatorarray['©ed1'] = 'edit1';
            $handyatomtranslatorarray['©ed2'] = 'edit2';
            $handyatomtranslatorarray['©ed3'] = 'edit3';
            $handyatomtranslatorarray['©ed4'] = 'edit4';
            $handyatomtranslatorarray['©ed5'] = 'edit5';
            $handyatomtranslatorarray['©ed6'] = 'edit6';
            $handyatomtranslatorarray['©ed7'] = 'edit7';
            $handyatomtranslatorarray['©ed8'] = 'edit8';
            $handyatomtranslatorarray['©ed9'] = 'edit9';
            $handyatomtranslatorarray['©fmt'] = 'format';
            $handyatomtranslatorarray['©inf'] = 'information';
            $handyatomtranslatorarray['©prd'] = 'producer';
            $handyatomtranslatorarray['©prf'] = 'performers';
            $handyatomtranslatorarray['©req'] = 'system_requirements';
            $handyatomtranslatorarray['©src'] = 'source_credit';
            $handyatomtranslatorarray['©wrt'] = 'writer';

            // http://www.geocities.com/xhelmboyx/quicktime/formats/qtm-layout.txt
            $handyatomtranslatorarray['©nam'] = 'title';           // iTunes 4.0
            $handyatomtranslatorarray['©cmt'] = 'comment';         // iTunes 4.0
            $handyatomtranslatorarray['©wrn'] = 'warning';
            $handyatomtranslatorarray['©hst'] = 'host_computer';
            $handyatomtranslatorarray['©mak'] = 'make';
            $handyatomtranslatorarray['©mod'] = 'model';
            $handyatomtranslatorarray['©PRD'] = 'product';
            $handyatomtranslatorarray['©swr'] = 'software';
            $handyatomtranslatorarray['©aut'] = 'author';
            $handyatomtranslatorarray['©ART'] = 'artist';
            $handyatomtranslatorarray['©trk'] = 'track';
            $handyatomtranslatorarray['©alb'] = 'album';           // iTunes 4.0
            $handyatomtranslatorarray['©com'] = 'comment';
            $handyatomtranslatorarray['©gen'] = 'genre';           // iTunes 4.0
            $handyatomtranslatorarray['©ope'] = 'composer';
            $handyatomtranslatorarray['©url'] = 'url';
            $handyatomtranslatorarray['©enc'] = 'encoder';

            // http://atomicparsley.sourceforge.net/mpeg-4files.html
            $handyatomtranslatorarray['©art'] = 'artist';           // iTunes 4.0
            $handyatomtranslatorarray['aART'] = 'album_artist';
            $handyatomtranslatorarray['trkn'] = 'track_number';     // iTunes 4.0
            $handyatomtranslatorarray['disk'] = 'disc_number';      // iTunes 4.0
            $handyatomtranslatorarray['gnre'] = 'genre';            // iTunes 4.0
            $handyatomtranslatorarray['©too'] = 'encoder';          // iTunes 4.0
            $handyatomtranslatorarray['tmpo'] = 'bpm';              // iTunes 4.0
            $handyatomtranslatorarray['cprt'] = 'copyright';        // iTunes 4.0?
            $handyatomtranslatorarray['cpil'] = 'compilation';      // iTunes 4.0
            $handyatomtranslatorarray['covr'] = 'picture';          // iTunes 4.0
            $handyatomtranslatorarray['rtng'] = 'rating';           // iTunes 4.0
            $handyatomtranslatorarray['©grp'] = 'grouping';         // iTunes 4.2
            $handyatomtranslatorarray['stik'] = 'stik';             // iTunes 4.9
            $handyatomtranslatorarray['pcst'] = 'podcast';          // iTunes 4.9
            $handyatomtranslatorarray['catg'] = 'category';         // iTunes 4.9
            $handyatomtranslatorarray['keyw'] = 'keyword';          // iTunes 4.9
            $handyatomtranslatorarray['purl'] = 'podcast_url';      // iTunes 4.9
            $handyatomtranslatorarray['egid'] = 'episode_guid';     // iTunes 4.9
            $handyatomtranslatorarray['desc'] = 'description';      // iTunes 5.0
            $handyatomtranslatorarray['©lyr'] = 'lyrics';           // iTunes 5.0
            $handyatomtranslatorarray['tvnn'] = 'tv_network_name';  // iTunes 6.0
            $handyatomtranslatorarray['tvsh'] = 'tv_show_name';     // iTunes 6.0
            $handyatomtranslatorarray['tvsn'] = 'tv_season';        // iTunes 6.0
            $handyatomtranslatorarray['tves'] = 'tv_episode';       // iTunes 6.0
            $handyatomtranslatorarray['purd'] = 'purchase_date';    // iTunes 6.0.2
            $handyatomtranslatorarray['pgap'] = 'gapless_playback'; // iTunes 7.0

            // http://www.geocities.com/xhelmboyx/quicktime/formats/mp4-layout.txt

            // boxnames:
            /*
            $handyatomtranslatorarray['iTunSMPB']                    = 'iTunSMPB';
            $handyatomtranslatorarray['iTunNORM']                    = 'iTunNORM';
            $handyatomtranslatorarray['Encoding Params']             = 'Encoding Params';
            $handyatomtranslatorarray['replaygain_track_gain']       = 'replaygain_track_gain';
            $handyatomtranslatorarray['replaygain_track_peak']       = 'replaygain_track_peak';
            $handyatomtranslatorarray['replaygain_track_minmax']     = 'replaygain_track_minmax';
            $handyatomtranslatorarray['MusicIP PUID']                = 'MusicIP PUID';
            $handyatomtranslatorarray['MusicBrainz Artist Id']       = 'MusicBrainz Artist Id';
            $handyatomtranslatorarray['MusicBrainz Album Id']        = 'MusicBrainz Album Id';
            $handyatomtranslatorarray['MusicBrainz Album Artist Id'] = 'MusicBrainz Album Artist Id';
            $handyatomtranslatorarray['MusicBrainz Track Id']        = 'MusicBrainz Track Id';
            $handyatomtranslatorarray['MusicBrainz Disc Id']         = 'MusicBrainz Disc Id';

            // http://age.hobba.nl/audio/tag_frame_reference.html
            $handyatomtranslatorarray['PLAY_COUNTER']                = 'play_counter'; // Foobar2000 - http://www.getid3.org/phpBB3/viewtopic.php?t=1355
            $handyatomtranslatorarray['MEDIATYPE']                   = 'mediatype';    // Foobar2000 - http://www.getid3.org/phpBB3/viewtopic.php?t=1355
            */
        }
        $info = &$this->getid3->info;
        $comment_key = '';
        if ($boxname && ($boxname != $keyname)) {
            $comment_key = (isset($handyatomtranslatorarray[$boxname]) ? $handyatomtranslatorarray[$boxname] : $boxname);
        } elseif (isset($handyatomtranslatorarray[$keyname])) {
            $comment_key = $handyatomtranslatorarray[$keyname];
        }
        if ($comment_key) {
            if ($comment_key == 'picture') {
                if (!is_array($data)) {
                    $image_mime = '';
                    if (preg_match('#^\x89\x50\x4E\x47\x0D\x0A\x1A\x0A#', $data)) {
                        $image_mime = 'image/png';
                    } elseif (preg_match('#^\xFF\xD8\xFF#', $data)) {
                        $image_mime = 'image/jpeg';
                    } elseif (preg_match('#^GIF#', $data)) {
                        $image_mime = 'image/gif';
                    } elseif (preg_match('#^BM#', $data)) {
                        $image_mime = 'image/bmp';
                    }
                    $data = array('data' => $data, 'image_mime' => $image_mime);
                }
            }
            $info['quicktime']['comments'][$comment_key][] = $data;
        }

        return true;
    }

    /**
     * @param  type $nullterminatedstring
     *
     * @return type
     */
    public function NoNullString($nullterminatedstring)
    {
        // remove the single null terminator on null terminated strings
        if (substr($nullterminatedstring, strlen($nullterminatedstring) - 1, 1) === "\x00") {
            return substr($nullterminatedstring, 0, strlen($nullterminatedstring) - 1);
        }

        return $nullterminatedstring;
    }

    /**
     * @param  type $pascalstring
     *
     * @return type
     */
    public function Pascal2String($pascalstring)
    {
        // Pascal strings have 1 unsigned byte at the beginning saying how many chars (1-255) are in the string
        return substr($pascalstring, 1);
    }
}
